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Assuming you've looked at the actual document (https://assets.documentcloud.org/documents/3914586/Googles-I...) and not redacted/censored versions of it, it does in fact have a lot of links...[0] How many citations would you expect though? He's not publishing for an academic journal. He's not even publishing for an audience outside of coworkers.

[0] Links from the paper in order not counting internal g/ go/ links, whatever those are (not all of them technically citations, but some are; many just to help point out that a technical definition is being used and a common parlance one the reader may have in mind shouldn't be used):

https://www.jstor.org/stable/25098770?seq=1#page_scan_tab_co...

https://en.wikipedia.org/wiki/Classical_liberalism

http://righteousmind.com/largest-study-of-libertarian-psych/

https://en.wikipedia.org/wiki/Sex_differences_in_psychology#...

http://onlinelibrary.wiley.com/wol1/doi/10.1111/j.1751-9004....

https://en.wikipedia.org/wiki/Empathizing%E2%80%93systemizin...

https://en.wikipedia.org/wiki/Neuroticism

http://www.bradley.edu/dotAsset/165918.pdf (My favorite in-context just because the link text is "research suggests", a common phrase that all too commonly lacks any sort of citation or link of any kind.)

http://quillette.com/2017/07/15/time-stop-worrying-first-wor...

https://en.wikipedia.org/wiki/Occupational_fatality#Risk_fac...

https://www.theatlantic.com/magazine/archive/2000/05/the-war...

http://www.sciencedirect.com/science/article/pii/01623095929...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5068300/

https://is.muni.cz/el/1423/jaro2011/SPP457/um/23632422/Hakim...

https://groups.google.com/a/google.com/d/msg/coffee-beans-di...

http://www.businessforum.com/WSJ_Race-on-Campus-05-06-2016.p...

https://www.city-journal.org/html/real-war-science-14782.htm...

https://heterodoxacademy.org/problems/

http://www.newyorker.com/science/maria-konnikova/social-psyc...

https://becauseits2015.wordpress.com/2016/08/06/a-non-femini...