The Oxford-Hachette concise French dictionary French-English, English-French
edited by Marie-Helene Correard
Oxford University Press, [Date of publication not identified]
 Buku Referensi
Neather, E.J.
Mastering French 2 : france and the french / E.J. Neather
MacMillan Press , 1985
 Buku Teks
Hoover, Kenneth R., 1940-, author
The elements of social scientific thinking
Thomson, 2008
 Buku Teks
Wilson, E. Bright, author
An Introduction to scientific research
McGraw-Hill, 1952
 Buku Teks
Engels, F. E.
Socialism Utopian and scientific
Foreign Languages Publishing House, 1958
 Buku Teks