Cita APA (7a ed.)
Covington, G. A., & Hannah, B. (1997). Access by design. Van Nostrand Reinhold.
Cita Chicago Style (17a ed.)
Covington, George A., y Bruce Hannah. Access by Design. New York: Van Nostrand Reinhold, 1997.
Cita MLA (9a ed.)
Covington, George A., y Bruce Hannah. Access by Design. Van Nostrand Reinhold, 1997.
Precaución: Estas citas no son 100% exactas.