Stanford Encyclopedia of Philosophy
SEP
The New Penguin Dictionary of Biology
Michael Abercrombie & M. L. Johnson & Michael Thain
On the Way to Language
Martin Heidegger
Men in Dark Times
Hannah Arendt
Medieval Italy: An Encyclopedia
Christopher Kleinhenz
Myths About Ayn Rand: Popular Errors and the Insights They Conceal
David Kelley & William R. Thomas & Alexander R. Cohen & Laurie Rice
The Ayn Rand Lexicon: Objectivism From a to Z
Ayn Rand & Harry Binswanger