The International Association of Universities, 1995
Buku Referensi
edited by Sandra L. Johnson ... [and others]
John Wiley & Sons, 1995
Buku Teks
Paris: The International Association of Universities, 1997
Buku Referensi
edited by K.M. Hussain
Organisation for Economic Co-operation and Development, 1977
Buku Teks
Taubman, Paul, 1939-
McGraw-Hill, 1974
Buku Teks SO