edited by W.L. Gibson, Jr, R.J. Hildreth, Gene Wunderlich
University of Nebraska Press, 1966
Buku Teks
Bhattacharyya, Dipak Kumar
Oxford University Press , 2014
Buku Teks
Routledge, 2018
eBooks
Schmitt, Neal W.
South-Western Publishing, 1991
Buku Teks
Anderson, Valerie
Kogan Page, 2024
Buku Teks SO