APA-referens (7:e uppl.)
Bruckmann, W. D. (1946). Keystones & theories of philosophy: A handbook to aid in the study of philosophy containing definitions of terms, a general explanation of theories, a glossary of technical terms, and a brief historical conspectus. Benziger.
Chicago-referens (17:e uppl.)
Bruckmann, William D. Keystones & Theories of Philosophy: A Handbook to Aid in the Study of Philosophy Containing Definitions of Terms, a General Explanation of Theories, a Glossary of Technical Terms, and a Brief Historical Conspectus. New York [usw.]: Benziger, 1946.
MLA-referens (9:e uppl.)
Bruckmann, William D. Keystones & Theories of Philosophy: A Handbook to Aid in the Study of Philosophy Containing Definitions of Terms, a General Explanation of Theories, a Glossary of Technical Terms, and a Brief Historical Conspectus. Benziger, 1946.
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