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Majalah, Jurnal, Buletin
Sherman, Howard J.
Harper and Row, 1989
Buku Teks
Diyan Wulandari
2014
UI - Skripsi (Membership)
edited by John R. Baldwin [and others]
Lawrence Erlbaum Associates, 2006
Buku Teks
Madan, T. N.
Sage, 2011
Buku Teks