Sex/Gender Distinction: A Reply to Plumwood & Response to Gatens
Val Plumwood & Moira Gatens
Ancient Philosophy: A Very Short Introduction
Julia Annas
Unification of Universes in Set Theory
Willard Van Orman Quine
Marx: A Very Short Introduction
Peter Singer
Introduction to Objectivist Epistemology
Ayn Rand & Leonard Peikoff