Flast, Robert, author
Berkely, California Osborne McGraw-Hill 1986,
Buku Teks
Campbell, Mary K., author
McGraw-Hill , 1986
Buku Teks
Bird, Richard M., author
Ward Lock, 1995
Buku Teks
Brennan, Lynne, author
Platkus, 1991
Buku Teks
Harberts, Kurt, author
Frederick A. Preager, 1963,
Buku Teks