American Heritage Publishing, 1961
Buku Teks SO
Washington United States Government Printing Office 1948
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edited by Tim Ingold
Routledge,
Buku Referensi
Janice Boddy and Michael Lambek, editors
Wiley Balckwell, 2016
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Antonius C.G. Robben
Wiley Blackwell, 2018
Buku Teks SO