White, John, author
Praeger , 1972
Buku Teks
Cambridge University Press, 2016
eBooks
Stephen J. Wayne [et all.]
Thomson, 2005
Buku Teks
Said, Sanib
Oxford University Press, 1985
Buku Teks
Grande, Sandy, 1964-, author
Rowman and Littlefield, 2015
Buku Teks