Carr, E.H. (Edward Hallet), author
What is history?
Vintage Books, 1961
 Buku Teks
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
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