Katili, J. A., author
Departemen Urusan Reseaech Nasional , [date of publication not identified]
Buku Teks
edited by D. Poche, C.M. Woolheater
Burgess, 1967
Buku Teks
Leet, Lewis Don, author
Prentice-Hall, 1958
Buku Teks
Hamblin, W. Kenneth (William Kenneth), 1928-, author
Burgen Publishing, 1967
Buku Teks
Gilluly, James, author
W.H. Freeman, 1959
Buku Teks