Krieger, Morris
McGraw-Hill, 1985
Buku Teks
Demille, Nelson
Warner Books, 1985
Buku Teks
Bandhu, Vishva, author
The V. V. Institute, 1956
Buku Referensi
Bauer, Laurie
Cambridge Cambridge University Press 1983
Buku Teks
Lorenzo, Barbara De, author
W.B. Saunders, 1985
Buku Referensi