McCarthy, N.K., author
McGraw-Hill, 2012
Buku Teks
Roberts, Sue, author
Facet Publishing, 2004
Buku Teks
editor, Wolfgang Kresse, David M. Danko
Springer, 2012
eBooks
Coombs, William E., author
McGraw-Hill, 1984
Buku Referensi
UNESCO, [T.th.]
Buku Teks