Concise oxford dictionary
Oxford University Press, New York
 Buku Referensi
Peter Salim
The contemporary English - Indonesian dictionary (sixth edition)
Modern English Press, 1991
 Buku Referensi
Park, Chris
A Dictionary environment and conservation
Oxford University Press, 2008
 Buku Referensi
Winson, Nicola V.
Illustrated dictionary of midwifery
Elsevier, 2005
 Buku Referensi
Winson, Nicola V.
Illustrated dictionary of midwifery
Elsevier , 2005
 Buku Referensi