Myers, Margaret G., author
Columbia University Press , 1970
Buku Teks
Mussatti, James
D. Van Nostrand Company, Inc., 1960
Buku Teks
Kemmerer, Donald L., author
Littlefield, Adams, 1956
Buku Teks
Rae, John B.
Mc Graw-Hill Book Company, 1949
Buku Teks
Risjord, Norman K., author
Prentice-Hall, 1985
Buku Teks