Duffy, Dean G.
TAB prefessional and reference books, 1986
Buku Teks SO
Duffy, Ben
Prentice-Hall, 1957
Buku Teks SO
Pople, Maureen
St.Lucia:University of Queenssland, 1986
Buku Teks SO
Rood, Lydia
Promotheus, 1998
Buku Teks
Mitton, Maureen
John Wiley & Sons, [date of publication not identified]
Buku Teks SO