Molony, John
Penguin Books Australia, 982
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Stewart, Douglas
Angus and Robertson, 1943
Buku Teks SO
Kelly, Carmel
Sea Cruise Books, 1985
Buku Teks SO
JOel, Lucille A.
McGraw-Hill, 2003
Buku Teks
JOel, Lucille A.
McGraw-Hill, 1999
Buku Teks SO