Carr, E.H. (Edward Hallet), author
What is history?
Penguin Books, 1975
 Buku Teks
Harcnack, Adolf, author
What is Christianity?
Harper & Brathers, 1957
 Buku Teks
Wolfe, Cary, author
What is posthumanism?
University of Minnesota Press, 2010
 Buku Teks
What Is Communism ?
edited by Richard M. Ketchum
Dutton , 1955
 Buku Teks
What is democracy ?
edited by Richard M. Ketchum
Dutton, 1955
 Buku Teks
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