Walker, Helen M.
Holt, Rinehart and Winston , 1969
Buku Teks
Armitage, P., author
Blackwell Scientific Publication, 1985
Buku Teks
Malinvaud, Edmond, author
North Holland , 1987
Buku Teks
Grant, Eugene L. (Eugene Lodewick), author
McGraw-Hill, 1996
Buku Teks
Andrews, Frank M.
University of Michigan, 1981
Buku Teks