Knapp, B., McCrae, D., & Ross, S. (1989). Challenge of the natural environment. Longman.
Citación estilo ChicagoKnapp, B.J, D.L.R McCrae, and S.R.J Ross. Challenge of the Natural Environment. Essex, Eng: Longman, 1989.
Cita MLAKnapp, B.J, et al. Challenge of the Natural Environment. Longman, 1989.
Warning: These citations may not always be 100% accurate.