Murphy, Wendy B., author
Time-Life Books, 1978
Buku Referensi
Buku Teks
editors, Harry M. Flechtner, Ronald A. Brand, Mark S. Walter
Oxford University Press, 2008
Buku Teks
Rosen, Michael, author
Walker, 2000
Buku Teks
edited by Elizabeth Popp Berman, Catherine Paradeise
Emerald, 2016
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