Kee, Poo-Kong
Regional Instute of Higher Education and Development , 1976
Buku Teks
Bandung : LIPI, 2006,
Majalah, Jurnal, Buletin
Malakolunthu, Suseela, editor
Routledge, Taylor & Francis Group, 2017
Buku Teks
Universiti Putra Malaysia,
Majalah, Jurnal, Buletin
Artikel Jurnal