Tyrell, L.W.M.
ELBS, 1971
Buku Teks
Laidler, Keith James, 1916-
Harcourt, Brace & World, 1966
Buku Teks
by Lewis G. Bassett ... [et al.]
Prentice-Hall, 1966
Buku Teks
Brady, James E., author
John Wiley & Sons, 1978
Buku Teks
Kneen, W.R., author
The English Language Book Society, 1974
Buku Teks