APA-čujuhus (7. p.)

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

Chicago-čujuhus (17. p.)

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

MLA-čujuhus (9. p.)

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

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