Busch, Moel F.
American Heritage Pub. Co., 1972
Buku Teks
Cullen, L. M. (Louis M.), author
Cambridge University Press, 2003
Buku Teks
Ellwood, Robert S. Jr
Wardsworth, 1980
Buku Teks
Pustaka Sinar Harapan, 1981
Buku Teks
Retno Afipah, author
1990
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