Maizell, Robert E.
John Wiley & Sons, 1979
Buku Referensi
edited by Andrea Wigbels Stewart, Carlette Washington-Hoagland, Carol T. Zsulya
Illinois ALA Editions, 2013
Buku Teks
Davis, Elisabeth B.
Marcel Dekker, 1981
Buku Referensi
McGraw-Hill , 1984
Buku Teks
Tsaioun, Katya, editor
John Wiley & Sons, 2011
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