Cita APA

Armstrong, T. R., & Armstrong, T. R. (1972). Why do we still have an ecological crisis? ([1. edition].). Englewood Cliffs, N.J.: Prentice Hall.

Citación estilo Chicago

Armstrong, Terry R., y Terry R. Armstrong. Why Do We Still Have an Ecological Crisis? [1. edition]. Englewood Cliffs, N.J.: Prentice Hall, 1972.

Cita MLA

Armstrong, Terry R., y Terry R. Armstrong. Why Do We Still Have an Ecological Crisis? [1. edition]. Englewood Cliffs, N.J.: Prentice Hall, 1972.