Enger, Eldon D.
McGraw-Hill, Higher Education, 2009
Buku Teks
Enger, Eldon D.
McGraw-HIll, 2003
Buku Teks
edited by Philip C. Laris, Jack G. Reynolds
Burgess, 1970
Buku Teks
Duff, Michael F.
Burgess, 1973
Buku Teks
Nielsen, Lewis T.
Buegess Publishing, 1967
Buku Teks