Lal, Bansi
Atma Ram & Sons, 1962
Buku Teks
Konkle, Gail S.
Prindle, Weber & Schmidt, 1974
Buku Teks
Smart, James R., author
Brooks/Cole Publishing, 1969
Buku Teks
Stubblefield, Beauregard, author
California Brooks, 1969
Buku Teks
Rich, Barnett, author
McGraw-Hill, 1963
Buku Teks