Lua APA (7ú heag.)

SOMERVIL BARBARA. (2019). THE STORY BEHIND COAL (2012 Ed.). RAINTREE PUBLISHERS.

Lua i Stíl Chicago (17ú heag.)

SOMERVIL BARBARA. THE STORY BEHIND COAL. 2012 Ed. CHICAGO: RAINTREE PUBLISHERS, 2019.

Lua MLA (9ú heag.)

SOMERVIL BARBARA. THE STORY BEHIND COAL. 2012 Ed. RAINTREE PUBLISHERS, 2019.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.