McElroy, Mark W.
Butterworth-Heinemann, 2003
Buku Teks
Johannes M. Bauer, Achim Lang, Volker Schneider, editors
[Springer, ], 2012
eBooks
March, James G.
Wiley, 1950
Buku Teks
Noor Ismawati Jaafar
University of Malaya, 2014
Artikel Jurnal
Baerman, Matthew
Cambridge University Press, 2017
Buku Teks