APA

Dyer W. W., Vriend J., . (1980). Group counseling for personal mastery: everything you need to know to lead any group in any setting. New York: Sovereign Books.

Chicago

Dyer Wayne W, Vriend John, . 1980. Group counseling for personal mastery: everything you need to know to lead any group in any setting. New York: Sovereign Books.

Harvard

Dyer W. W., Vriend J., . (1980). Group counseling for personal mastery: everything you need to know to lead any group in any setting. New York: Sovereign Books.

MLA

Dyer Wayne W, Vriend John, . Group counseling for personal mastery: everything you need to know to lead any group in any setting. New York: Sovereign Books. 1980.