Kintner, Earl W., author
Macmillan, 1975
Buku Teks
McManis, Charles R., author
Thomson , 2004
Buku Teks
Oxford University Press, 1964
Buku Teks
Tallack, Douglas
Longman, 1991
Buku Teks
Gerald B. Halt, John C. Donch, Amber R. Stiles, Lisa Jenkins VanLuvanee, Brandon R. Theiss, Dana L. Blue
Springer Nature, 2019
eBooks