Schapiro, Leonard
Frederick A. Praeger Publishers, 1965
Buku Teks
Bunyan, James
The Johns Hopkins Press, 1936
Buku Teks
Duke University Press , 1981
Buku Teks
Kowalski, Ronald
Routledge, 1997
Buku Teks
Moorehead, Alan, author
Harper and Brother, 1958
Buku Teks