Brunner, Lillian Sholtis, author
J.B. Lippincott, 1984
Buku Teks
Williams, Linda S., author
F.A. Davis, 2003
Buku Teks
Lindberg, Donald A.B., author
Charles C. Thomas, 1968
Buku Teks
World Book, 1992
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Ingo-Eric M.
London : k.C. Saur Munchen, 1981,
Buku Referensi