Green, D.C., author
Longman, 1995
Buku Teks
Carroll, John Millar, 1925-, author
McGraw-Hill, 1956
Buku Teks
Green, D.C., author
Longman, 1988
Buku Teks
Ryder, John D. (John Douglas), author
McGraw-Hill, 1957
Buku Teks
Shina, Sammy G.,
McGraw-Hill, 2002
Buku Teks