Universitas Indonesia, 2007
UI - Skripsi (Membership)
Johnston, R.J. (Ronald John), author
Longman, 1978
Buku Teks
David J. Bartholomew ... [et.al]
CRC Press, Taylor & Francis Group, 2008
Buku Teks
Universitas Indonesia, 2006
UI - Skripsi (Membership)
Heumann, Christian, author
Springer International Publishing, 2016
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