Liggett, John V.
Prentice-Hall, 1993
Buku Teks
edited by Albert Thumann
The Fairmont Press, 1988
Buku Referensi
edited by Albert Thumann
Fairmont Press, 1988
Buku Referensi
Sumur Bandung, 1983
Buku Teks
edited by Byron D. Tapley
John Wiley & Sons, 1990
Buku Referensi