B. Espen Eckbo
Elsevier, 2010
Buku Teks
Mackintosh, A.S.
Cambridge University Press , 1963
Buku Teks
Paulus Wirutomo, author
2014
Artikel Jurnal
Dody Hapsoro, author
FEUI, 2017
Artikel Jurnal
Behrman, Jack N., author
Oelgeschlager, Gunn & Gunn & Hain , 1980
Buku Teks