APA aipamena

DUGGER, J. (1992). Business Letter For Busy People Jim Dugger. Golden Books Centre.

Chicago Style aipamena

DUGGER, Jim. Business Letter For Busy People Jim Dugger. Golden Books Centre, 1992.

MLA aipamena

DUGGER, Jim. Business Letter For Busy People Jim Dugger. Golden Books Centre, 1992.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.