The Linguistics encyclopedia : second edition
edited by Kirsten Malmkjær
Routledge, 2004
 Buku Referensi
Wright, Samson
Applied physiology : second edition
Oxford University Press, 1928
 Buku Referensi
Polyanin, Andrei D.
Handbook of integral equations : second edition
Chapman &Hall/CRC, 2008
 Buku Referensi
Chiang, Alpha C., 1927-
Exercises in aggregate economics, second edition
Holt, Rinehart and Winston, 1968
 Buku Teks
Handbook of qualitative research : second edition
Norman K. Denzin, Yvonna S. Lincoln, editors
Sage Publications, 2000
 Buku Referensi