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The New York Academy of Sciences, [date of publication not identified]
Buku Teks
Singarimbun, Masri, author
University of California Press, 1975
Buku Teks
edited by Paul Bohannan and John Middleton
Natural History Press, 1968
Buku Teks
Sihotang, Tama Sintaria, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2018
UI - Makalah dan Kertas Kerja
Sibeth, Achim
Thames and Hudson, 1991
Buku Teks