Campbell, J. (1991). Introductory cartography (2nd ed.). Wm. C. Brown.
Lua i Stíl Chicago (17ú heag.)Campbell, John. Introductory Cartography. 2nd ed. Dubuque, Ia: Wm. C. Brown, 1991.
Lua MLA (9ú heag.)Campbell, John. Introductory Cartography. 2nd ed. Wm. C. Brown, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.