Ackerman, James S., author
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Buku Teks
edited by Louwrien Wijers
Academy Editions, 1996
Buku Teks
Sage Publications , 2018
Majalah, Jurnal, Buletin
University of technology,
Majalah, Jurnal, Buletin
Freeland, Cynthia A., author
Oxford University Press, 2001
Buku Teks