Kolff, G. H. van der, author
The Institute of Pacific Relations, [19--?]
Buku Klasik
Gloor, Peter A., author
Emerald, 2017
eBooks
Wilding, Michael, author
Wild & Woolley, 1976
Buku Teks
Golovach, Aleksandr Fedorovich, author
MIR Publisher, 1967
Buku Teks
Gray, C.B., author
Longman Scientific & Technical, 1989
Buku Teks