Artikel Jurnal
tim editor Budi S. Pikir ... [and others]
Airlangga University Press, 2015
Buku Teks
Jones, Vern
Kencana, 2012
Buku Teks
Manullang, Laurence A.
Salemba Empat, 2013
Buku Teks
edited by Christopher C. Harmon, Andrew N. Pratt, Sebastian Gorka
McGraw-Hill, 2011
Buku Teks