edited by Bruce W. Burkhart and Wesley S. Thompson
Burgess Publishing, 1972
Buku Teks
Mertens, Thomas R.
Burgess, 1968
Buku Teks
Deason, Temp R.
Burgess, 1968
Buku Teks
Beck, Raymond W.
Burgess, 1977
Buku Teks
Hehman, Robert F.
Costomized Publishing Division, 1976
Buku Teks