Masefield, John
William Heinemann , 1947
Buku Teks SO
Frederick S. Merritt and Jonathan T. Ricketts, editor
McGraw-Hill, Inc, 1994
Buku Referensi
Traister, John E.
Prentice-Hall, 1978
Buku Teks
Traister, John E.
McGraw-Hill, 1985
Buku Teks
Ching, Francis D.K., 1943-
[publisher not identified], [date of publication not identified]
Buku Teks SO