Gdddk

I am experiencing a weird issue in my bibliography.

I have a bibtex entry like:

@onlinepsqldocs,
 author = PostgreSQL Development Team,
 title = "PostgreSQL Documentation",
 url = https://www.postgresql.org/docs/

That results in:

[42] PostgreSQL Development Team. PostgreSQL Documentation, . Retrieved
from: https://www.postgresql.org/docs/.

As you can see, there is an extra comma after the title, as bibtex is waiting for the year field. In fact, if I add a year entry for psqldocs, the formatting is ok, having title, year.

How can I fix this? This is a MWE:

documentclass[13pt, a4paper, titlepage, oneside]book
setcountertocdepth4
setcountersecnumdepth4
usepackage[T1]fontenc
usepackage[english]babel
usepackage[latin1]inputenc
usepackage[left=3.00cm, right=3.00cm, top=3.00cm, bottom=3.00cm]geometry
usepackagesetspace
renewcommandbaselinestretch1.2
usepackage[fontsize=13pt]scrextend
usepackagexcolor
definecolorwinergb0.5,0,0
usepackagehyperref
hypersetup
 colorlinks = true,
 linkcolor = .,
 citecolor = .,
 filecolor = .,
 menucolor = .,
 runcolor = .,
 urlcolor = wine

renewcommandUrlFontsmall
usepackagebreakurl
usepackage[square,comma,numbers]natbib
bibliographystyleunsrtnat
begindocument
 citepsqldocs
 bibliographyref
enddocument

With ref.bib containing the above bibliography entry.

Please note that, for previous similar entries, I do not see this behavior. For example:

@online piezoelectr,
 author = "ScienceDirect",
 title = "Piezoelectricity",
 url = "https://www.sciencedirect.com/topics/materials- science/piezoelectricity"

results in:

[1] ScienceDirect. Piezoelectricity. Retrieved from: 
https://www.sciencedirect.com/topics/materials-science/piezoelectricity.

as expected.

Note that using "s instead of braces had no effect.

EDIT:

This is the version of the TeX distro I am using (simply obtained inputting pdflatex into my terminal):

This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018/Arch Linux) (preloaded format=pdflatex)

In addition, I have fixed my MWE. I confirm that I cannot reproduce the described issue. Any clue?

Some comments and suggestions:

• Load the hyperref package last.




• Since you're loading the setspace package, you have no possible valid excuse for inputting renewcommandbaselinestretch1.2. Instead, please input setstretch1.2.




• Instead of [left=3.00cm, right=3.00cm, top=3.00cm, bottom=3.00cm], please just write [margin=3cm].




• Do encase PostgreSQL Development Team in an extra pair of curly braces. That way, you signal to BibTeX that it's dealing with a so-called "corporate" author rather than with a person with surname Team, first name PostgreSQL, and middle name Development.

RequirePackagefilecontents
beginfilecontentsref.bib
@onlinepsqldocs,
 author = PostgreSQL Development Team,
 title = "PostgreSQL Documentation",
 url = https://www.postgresql.org/docs/

@online piezoelectr,
 author = "ScienceDirect",
 title = "Piezoelectricity",
 url = "https://www.sciencedirect.com/topics/materials- science/piezoelectricity"

endfilecontents

documentclass[13pt, a4paper, titlepage, oneside]book
setcountertocdepth4
setcountersecnumdepth4
usepackage[T1]fontenc
usepackage[english]babel
usepackage[utf8]inputenc
usepackage[margin=3cm]geometry
usepackagesetspace
setstretch1.2
%renewcommandbaselinestretch1.2
usepackage[fontsize=13pt]scrextend
usepackagexcolor
definecolorwinergb0.5,0,0

usepackage[square,comma,numbers]natbib
bibliographystyleunsrtnat

usepackageurl
renewcommandUrlFontsmall

usepackagehyperref
hypersetup
 colorlinks = true,
 linkcolor = .,
 citecolor = .,
 filecolor = .,
 menucolor = .,
 runcolor = .,
 urlcolor = wine

begindocument
 citepsqldocs, citepiezoelectr
 bibliographyref
enddocument