Cita APA (7a ed.)

Kelly, J. R., & Warnick, R. B. (1999). Recreation trends and markets: The 21st century. Sagamore.

Cita Chicago Style (17a ed.)

Kelly, John R., y Rodney B. Warnick. Recreation Trends and Markets: The 21st Century. Champaign, Illinois: Sagamore, 1999.

Cita MLA (9a ed.)

Kelly, John R., y Rodney B. Warnick. Recreation Trends and Markets: The 21st Century. Sagamore, 1999.