Hanna, P. R., Sabaroff, R. E., Davies, G. F., & Farrar, C. R. (1966). Geography in the teaching of social studies: Concepts and skills. Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Hanna, Paul Robert, Rose E. Sabaroff, Gordon F. Davies, agus Charles R. Farrar. Geography in the Teaching of Social Studies: Concepts and Skills. Boston: Houghton Mifflin, 1966.
Lua MLA (9ú heag.)Hanna, Paul Robert, et al. Geography in the Teaching of Social Studies: Concepts and Skills. Houghton Mifflin, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.