Masefield, John
William Heinemann , 1947
Buku Teks SO
Frederick S. Merritt and Jonathan T. Ricketts, editor
McGraw-Hill, Inc, 1994
Buku Referensi
Ching, Francis D.K., 1943-
[Publisher not identified], [Date of publication not identified]
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Gutdeutsch, Goitz
Birkhal'user, 1997
Buku Teks SO
Ching, Francis D.K., 1943-
John Wiley & Sons, 2008
Buku Teks SO