Masefield, John
William Heinemann , 1947
Buku Teks SO
Jerome, Harry
Routledge , 1934
Buku Teks
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