Angela Royston. (2003). Heavy and Light (Heinemann First Library). Heinemann/Raintree.
Čikaški stil citiranja (17. izdanje)Angela Royston. Heavy and Light (Heinemann First Library). Heinemann/Raintree, 2003.
MLA način citiranja (9. izdanje)Angela Royston. Heavy and Light (Heinemann First Library). Heinemann/Raintree, 2003.
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