Gaya APA

Simeonova, V., Nenov, N. (2009). British physics olympiads (book 1) . Scotts Valley, California: CreateSpace Independent Publishing Platform.

Gaya MLA

Simeonova, V.., Nenov, N.. "British physics olympiads (book 1)". Scotts Valley, California: CreateSpace Independent Publishing Platform, 2009. Text.