(2006). Guidelines for soil description (fourth edition.).
Lua i Stíl Chicago (17ú heag.)Guidelines for Soil Description. fourth edition. 2006.
Lua MLA (9ú heag.)Guidelines for Soil Description. fourth edition. 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.