Burchett, Wilfred
Hanoi: Foreign Language Publishing House, 1964
Buku Teks
Department of Foreign Affairs Philippines
[Publisher not identified], 1975
Buku Teks SO
Zhang, Yingli
China Intercontinental Press, 2011
Buku Teks
National Academy of Sciences-National Academy of Engineering , 1973
Buku Teks SO
edited by Don K. Price
Prentice-Hall, 1960
Buku Teks