Youth Coordination Centre International, 2003
Buku Teks
Suzuki, Kazuhito, author
Springer Nature, 2019
eBooks
Trustco, 2010
Multimedia
Smith, Brenda D., author
Longman, 2000
Buku Teks
Lean Mei Li, Mya Khemlani David, Ngew Yeok Meng, editor
University of Malaya, 2011
Buku Teks