Mann, C. K., Grindle, M. S., & Shipton, P. M. (1989). Seeking solutions. Kumarian Press.
Cita Chicago (17th ed.)Mann, Charles Kellogg, Merilee Serrill Grindle, i Parker MacDonald Shipton. Seeking Solutions. West Hartford, Conn., USA: Kumarian Press, 1989.
Cita MLA (8th ed.)Mann, Charles Kellogg, et al. Seeking Solutions. Kumarian Press, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.