Adkins, Dorothy C.
Charles E. Merrill Books , 1964
Buku Teks
Kuzma, Jan W.
Mayfield Publ., 1984
Buku Teks
Siegel, Sidney
Armico, 1985
Buku Teks
Hinkle, Dennis E.
Houghton Mifflin, 2003
Buku Teks
Gravetter, Frederick J.
Cengage Learning, 2017
Buku Teks