London : IP Publishing Ltd
Majalah, Jurnal, Buletin
Australia : University of Melbourne
Majalah, Jurnal, Buletin
Ann Arbor University of Michigan, 1969
Buku Teks
Manila : The University Research Coordination, 2006,
Majalah, Jurnal, Buletin
Jakarta : Lembaga Penelitian UI, 1996,
Majalah, Jurnal, Buletin