editor Jim West
PennWell Pub. Co., 1998
Buku Referensi
Johnston, Daniel
Penwell Books, 1994
Buku Teks
Adelman, M.A.
Johns Hopkins University Press, 1972
Buku Teks
Frankel, P.H.
Chapman and Hall, 1946
Buku Teks
Porter, Stanley P.
McGraw-Hill, 1965
Buku Teks