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