Smith, Robert Leo
Harper Collins, 1990
Buku Teks
Benton, Allen H.
Burgess Publishing Company, 1972
Buku Teks
Smith, Robert Leo
Benjamin Cummings, 2001
Buku Teks
Brewer, Richard
Saunders College Publishing, 1982
Buku Referensi
Ghazoul, Jaboury
Oxford University Press, 2016
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