Nelson, Gideon E.
Buku Teks
Nelson, Gideon E., author
John Wiley & Sons, 1984
Buku Teks
Copstead, Lee-Ellen C., author
W.B. Saunders , 2000
Buku Teks
edited by Anthony Gale, Michael W. Eysenck
John Wiley & Sons, 1992
Buku Referensi
Copstead, Lee-Ellen C., author
W.B. Saunders, [date of publication not identified]
Buku Teks