Cambridge University Press, 2019
eBooks
Rugman, Alan M., author
McGraw-Hill, 1985
Buku Teks
edited by John Vogler and Mark F. Imber
Routledge , 1996
Buku Teks
Rugman, Alan M., author
McGraw-Hill , 1985
Buku Teks
Vernon, Raymond, author
Prentice-Hall, 1981
Buku Teks