Cita APA (7a ed.)
Covington, W. G. Creativity and General Systems Theory. Universal Publishers.
Cita estilo Chicago (17a ed.)
Covington, William G. Creativity and General Systems Theory. Boca Ratón, EUA: Universal Publishers.
Cita MLA (9a ed.)
Covington, William G. Creativity and General Systems Theory. Universal Publishers.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.