Willig, Sidney H., author
Symposium Enterprises, 1971
Buku Teks
Moore, Herbert, author
McGraw-Hill, 1942
Buku Teks
McCarty, F. William
IRWIN, 1990
Buku Teks
Buttler, Henry N.
South-Western Publishing Co., 1987
Buku Teks
Blackburn, John D., author
Richard D. Irwin , 1985
Buku Teks