Speak, P., & Carter, A. H. C. (1981). Map reading and interpretation (New edition.). Longman.
Cita Chicago (17th ed.)Speak, P., i A. H. C. Carter. Map Reading and Interpretation. New edition. England: Longman, 1981.
Cita MLA (9th ed.)Speak, P., i A. H. C. Carter. Map Reading and Interpretation. New edition. Longman, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.