Gaya APA

Andreescu, R, G, T. (2007). Putnam and beyond (978-387-25765-5 (13)). USA: Springer Science Bussiness Media, LLC.

Gaya MLA

Andreescu, Razvan, Gelca,, Titu. "Putnam and beyond". 978-387-25765-5 (13) USA: Springer Science Bussiness Media, LLC, 2007. Text.