Gratzer, George, author
Academic Press, 1978
Buku Teks
Centre for Human Right, United Nations , 1991
Buku Teks
Kristiansen, Nancy S., author
[American Society for Training and Development Press;, ], 2005
eBooks
Rebecca Allen, editor
Royal Society of Chemistry, 1989
Buku Referensi
Fang, Yuqing, author
Beijing daxue Chubanshe, 2000
Buku Teks