Benyus, Janine M. author
Black Dog & Leventhal Publishers, 2014
Buku Referensi
Williams, Marta, author
New World Library, 2003
Buku Teks
Scott, John Paul, author
University of Chicago Press, 1958
Buku Teks
edited by H.H. Shorey, John J. McKelvey
John Wiley & Sons, 1977
Buku Teks
Tinberger, Niko, author
Time Life Book, 1970
Buku Teks