Botzler, R. G., & Armstrong, S. J. (1998). Environmental ethics: Divergence and convergence (2nd ed.). McGraw-Hill.
Chicago Style aipamenaBotzler, Richard George, and Susan J. Armstrong. Environmental Ethics: Divergence and Convergence. 2nd ed. Boston, Mass: McGraw-Hill, 1998.
MLA aipamenaBotzler, Richard George, and Susan J. Armstrong. Environmental Ethics: Divergence and Convergence. 2nd ed. McGraw-Hill, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.