edited by Pavlos Kanaroglou, Eric Delmelle and Antonio Páez
Routledge, 2018
Buku Teks SO
Johnson, James H.
Pergamon Press, 1972
Buku Teks SO
Fotheringham, A. Stewart
Sage, 2000
Buku Teks SO
Mather, P.M.
John Wiley & Sons, 1976
Buku Teks SO
Yeh, Stephen H.K.
UNESCO, 1990
Buku Teks