Kennedy, Daniel S.
S.S. Mubaruk , 1991
Buku Teks
Warmke, Roman F.
South-Western Publishing Co., 1976
Buku Teks
Lehmann, Donald R., author
McGraw-Hill, 2005
Buku Teks
Bearden, William O., author
McGraw-Hill/Irwin, 2004
Buku Teks
Vaile, Roland S.
The Roland Press Company , 1952
Buku Teks