Robbin, Stephen P, author
Pearson Prentice Hall, 2005
Buku Teks
Bank, Stephen
Prentice-Hall, 1990
Buku Teks
Ladas, Stephen P.
Macmillan, 1938
Buku Teks
Borgatti, Stephen P, author
Sage, 2013
Buku Teks
Cuthbertson, Keith
The University of Michigan, 1992
Buku Teks