Lo, Raymond
Times Books International, 1996
Buku Teks
Hailey, Elizabeth Forsythe, author
Deal Book, 1991
Buku Teks
Williams, Gareth, author
PSI, [date of publication not identified]
Buku Teks
edited by Ada K. Jacox, Catherine M. Norris
Appleton-century-crofts , 1977
Buku Teks
Delmar Publishers, 1992
Buku Teks