Some of the quotes are real (notably those from Sun Tzu) and others are made up by the author.
Q. Heya, looking to find the origin of a reference you have in the first Bobiverse book. Chapter 14 intro. I’d like to find that or common content to reference for an article.
Dennis E. Taylor: Sorry, that’s completely made up. Also, no one so far seems to have caught on that Lawrence Vienn is a tuckerization of Larry Niven.
http://dennisetaylor.org/about
I'm pretty sure that the other names; Stephen Carlisle and Eduard Guijpers are also similar in-jokes.
The other names are entirely fictitious and aren't anagrams, just names invented by the author.
Q. If Lawrence Vienn = Larry Niven, then who are the other two (Stephen Carlisle and Eduard Guijpers)?
Dennis E. Taylor: I just made them up. But I wanted to get Niven in there.
Via Twitter - 15 Mar 2019
Note also that the various synposia that supposedly spawned these quotes ("Exploring the Galaxy", "Designing a Von Neumann Probe") are set in-universe.
I waggled my eyebrows at her and continued, “And I just went to a couple of very interesting panels. Exploring the Galaxy and Designing a Von Neumann Probe.”