Vasta, Ross, author
John Wiley & Sons, 2004
Buku Teks
Hurlock, Elizabeth Bergner, 1898-, author
McGraw-Hill, 1985
Buku Teks
Lindstrom, Martin, author
PPM, 2005
Buku Teks
Lindstrom, author
PPM, 2005
Buku Teks
edited by C. Henry Kempe, Roy E. Helfer
University of Chicago Press, 1980
Buku Teks