Runyon, Richard P.
Addison Wesley Publ., 1967
Buku Teks
Elifson, Kirk W., 1943-, author
McGraw-Hill, 1990
Buku Teks
Siegel, Sidney, author
Armico, 1985
Buku Teks
Kaplan, Robert M., author
Allyn and Bacon , 1987
Buku Teks
Adkins, Dorothy C., author
Charles E. Merrill Books , 1964
Buku Teks