Baldwin, George B. (George Benedict), 1920-, author
John Hopkins Press, 1967
Buku Teks
Frye, Richard N.
Henry Holt and Company, 1953
Buku Teks
Frye, Richard N.
Allen & Unwin , 1960
Buku Teks
Haas, William S.
Columbia University Press, 1946
Buku Teks
Bidgool, 2008
Buku Referensi