Duellman, William E., author
McGraw-Hill, 1986
Buku Referensi
Island, 2000
Buku Teks
Blum, Mark, author
Chronicle Books, 1999
Buku Referensi
editors, Tim Halliday, Kraig Adler
Facts on File, 1994
Buku Referensi
Rothschild, Bruce M., author
Springer, 2012
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