Cambridge University Press, 2020
eBooks
McMullin, Rian E, author
W.W. Norton, 2000
Buku Teks
Robson, R.W., author
Pacific Publications PTY, 1954
Buku Teks
Cambridge University Press, 2020
eBooks
edited by Clarence L. Barnhart
Appleton-Century-Crofts, 1956
Buku Referensi