Ebb, Lawrence F., author
West Publishing, 1964
Buku Teks
Fenn, Dan H. (Dan Huntington), 1923-, author
McGraw-Hill , 1957
Buku Teks
Anderson, Ronald A., author
South-Western Publishing Company, 1950
Buku Teks
Corley, Robert Neil, author
McGraw-Hill, 1987
Buku Teks
Stoever, William A., author
Lexington Books, 1981
Buku Teks