Anderson, Jon, 1973-, Author
Routledge, 2015
Buku Teks
edited by Philip L. Wagner, Marvin W. Mikesell
University of Chicago Press, 1962
Buku Referensi
Warf, Barney, editor
Springer, 2012
eBooks
Martin, A.W.
Rigby Limited, 1962
Buku Teks
Trewartha, Glenn T., author
McGraw-Hill, 1967
Buku Teks