Crouse, William H., author
McGraw-Hill Boook Company, 1956
Buku Teks
Johnson, James A., 1908-, author
McGraw-Hill, 1977
Buku Teks
Crouse, William H., author
McGraw-Hill , 1984
Buku Teks
Belt, Forest H.
H. W. Sams , [1973]
Buku Teks
Thiessen, Frank J.
Reston Publishing, 1984
Buku Teks