Gerhards, Jürgen, 1955-, author
Routledge, 2017
Buku Teks
Schultz, Theodore W., author
Free Press, 1971
Buku Teks
Harbison, Frederick Harris, author
McGraw-Hill, 1964
Buku Teks
edited by Jeffrey F. Addicott, Md. Jahid Hossain Bhuiyan, Tareq M.R. Chowdhur
Oxford University press, 2012
Buku Teks
Harbison, Frederick Harris, author
International Institute for Educational Planning Unesco , 1967
Buku Teks