edited by John J. Marchalonis
John Wiley & Sons, 1982
Buku Teks
edited by L.E. Glynn and M.W. Steward
John Wiley & Sons, 1977
Buku Teks
Dyah Rinni, author
Falcon Publishing, 2016
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Briggs, Asa
Longman, 1974
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Badan Rehabilitasi dan Rekonstruksi NAD-Nias, 2009
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