Παραπομπή APA

Olson, J. F. Writing skills success in 20 minutes a day. Goodwill Publishing House.

Παραπομπή Chicago Style

Olson, Judith F. Writing Skills Success in 20 Minutes a Day. New Delhi: Goodwill Publishing House.

Παραπομπή MLA

Olson, Judith F. Writing Skills Success in 20 Minutes a Day. Goodwill Publishing House.