Vernon, Mark
Bisnis: the key concepts = Business: the key concepts
RajaGrafindo Persada, 2011
 Buku Teks
Key concepts in geography
edited by Sarah L. Holloway, Stephen P. Rice, Gill Valentine
Sage, 2003
 Buku Teks SO
Hayward, Susan
Key concepts in cinema studies
Routledge, 1996
 Buku Teks SO
Cashmore, Ellis
Sport psychology : the key concepts
Routledge, 2002
 Buku Teks SO
Trask, R.L.
Key concepts in language and linguistics
London, 1998
 Buku Referensi