Douglas, I., & Spencer, T. (1982). Applied geomorphology in the tropics. Borntraeger.
Lua i Stíl Chicago (17ú heag.)Douglas, Ian, agus T. Spencer. Applied Geomorphology in the Tropics. Berlin: Borntraeger, 1982.
Lua MLA (8ú heag.)Douglas, Ian, agus T. Spencer. Applied Geomorphology in the Tropics. Borntraeger, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.