Sheldon Anderson ... [and others]
Westview Press, 2015
Buku Teks
Kemp, David D., author
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Buku Teks
edited by. Vinod K. Lal, Danial Khemchand
Anmol Publications, 1997
Buku Referensi
Payne, Richard J., 1949-, author
Pearson Education , 2014
Buku Teks
editors, Cheris Kramarae, Dale Spender
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Buku Referensi