APA Style
Kaspar, G. et al (1989).
Cross-Cultural Pragmatics: Requests and Apologies .
Norwood, NJ 07648:
Ablex Publishing.
MLA Style
Kaspar, Gabriele. et al.
"Cross-Cultural Pragmatics: Requests and Apologies".
Norwood, NJ 07648:
Ablex Publishing,
1989.
Buku PGSD.