Rosen, Paul L.
University of Illinois Press, 1972
Buku Teks
Wallace, Walter L.
Aldine Publishing Company, 1971
Buku Teks
Thill, John V., author
McGraw-Hill, 1991
Buku Teks
Crowder, L.V., author
UGM Press, 1986
Buku Teks
Thill, John V., author
McGraw-Hill, 1993
Buku Teks