Gaya APA
Wallen, M. (1989).
Person to person: Students' book / Richard D Lewis, Chris Harris, Matt Wallen .
:
Grosvenor Press.
Gaya MLA
Wallen, Matt.
"Person to person: Students' book / Richard D Lewis, Chris Harris, Matt Wallen".
:
Grosvenor Press,
1989.
Ekonomi Syariah.