Critchley, F. W., Drummond, H. D., & Hughes, J. W. (1983). The western hemisphere (Teacher's edition.). Allyn and Bacon.
Citazione stile Chigago Style (17a edizione)Critchley, Faith W., Harold D. Drummond, e James W. Hughes. The Western Hemisphere. Teacher's edition. Boston [u.a.]: Allyn and Bacon, 1983.
Citatione MLA (9a ed.)Critchley, Faith W., et al. The Western Hemisphere. Teacher's edition. Allyn and Bacon, 1983.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.