Vachek, Josef, author
Indiana University Press, 1966
Buku Teks
Galambos, Janos, author
John Wiley & Sons, 1978
Buku Teks
Roulet, Eddy
Longman, 1979
Buku Teks
Masinambow, Eduard Karel Markus, author
Universitas Indonesia, 1962
UI - Skripsi (Membership)
Cambridge University Press, 2000
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