Pitt, David C.
Pergamon Press, 1976
Buku Teks
Wood, James L.
Wadsworth, 1982
Buku Teks
Steven N. Durlauf, H. Peyton Young, editor
MIT Press, 2001
Buku Teks
edited by Gove Hambidge ; foreword by Teodoro Moscosco, introd. by Paul G. Hoffman
Frederick A. Praeger, 1964
Buku Teks
Sorokin, Pitirim A.
American Book, 1941
Buku Teks