I think they got most of their material by hitting up their professors for old books. I got...

  • The Tools of Social Science (1953)
  • The Art of Scientific Writing: From Student Reports to Professional Publications in Chemistry and Related Fields (1987)
  • On Writing Well (Third Edition, 1985)
  • A Manual for Writers of Term Papers, Theses, and Dissertations (Fifth Edition, 1987)
  • The Biologic Ages of Man: From Conception Through Old Age (1973)
  • And for Mother Woot, a book about cancer and another book about home landscaping.

Literally all of these books are older than I am.