Trippett, Frank, author
Time-Life Books, 1974
Buku Teks
Hamblin, Dora Jane, author
Time-Life International, 1975
Buku Teks
McCormack, T.H., author
University Tutonial Press, 1980
Buku Teks
Covey, Stephen R., author
Gramedia Pustaka Utama, 1995
Buku Teks
Hsiung, Chuan-Chih, author
John Wiley & Sons, 1981
Buku Teks