Pattillo, James W.
Lousiana State University Press , 1965
Buku Teks
Pizzey, Alan
Holt, Rinehart and Winston, 1980
Buku Teks
Mepham, Michael J.
Garland Publishing, 1988
Buku Teks
Mattesich, Richard
Ill. Irwin 1964, 1964
Buku Teks
Warren, Carl S.
South-Western College, 1999
Buku Teks