Παραπομπή APA

Kenneth Williams & Mark Gaskell. (2002). Teacher's guide: The cosmic calculator (books 1,2 and 3). Motilal Banarsidass.

Παραπομπή Chicago Style

Kenneth Williams και Mark Gaskell. Teacher's Guide: The Cosmic Calculator (books 1,2 and 3). New Delhi: Motilal Banarsidass, 2002.

Παραπομπή MLA

Kenneth Williams και Mark Gaskell. Teacher's Guide: The Cosmic Calculator (books 1,2 and 3). Motilal Banarsidass, 2002.