BOYCE, R. R. (1982). Geographic perspectives on global problems: An introduction to geography. John Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)BOYCE, Ronald Reed. Geographic Perspectives on Global Problems: An Introduction to Geography. New York: John Wiley and Sons, 1982.
Lua MLA (9ú heag.)BOYCE, Ronald Reed. Geographic Perspectives on Global Problems: An Introduction to Geography. John Wiley and Sons, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.