Norm Friesen
Sense, 2012
eBooks
Brown, Richard H.
Cambridge University Press, 1977
Buku Teks
Leeming, Glenda
Macmillan, 1989
Buku Teks
Lewis, C. Day
Jonathan Cape, 1949
Koleksi Publik
Mathew A. White, Gavin R. Slemp, A. Simon Murrary, editors
Springer, 2017
Buku Teks