Block, Stanley B., author
Canfield Press, 1973
Buku Teks
Dauten, Carl Anton, 1913-, author
Prentice-Hall, 1948
Buku Teks
Marshall, Peter, author
Glorier International, 2001
Buku Referensi
Sears, John T., author
University of Toronto Press, 1972
Buku Teks
Fraser, Jill Andresky, author
Bloomberg Press, 2002
Buku Teks