APA

Burbidge N., Gray P., Levy S. & Rinvolucri M. (1996). Letters. Oxford: Oxford University Press.

Chicago

Burbidge N, Gray P, Levy Sh and Rinvolucri M. 1996. Letters. Oxford: Oxford University Press.

Harvard

Burbidge N., Gray P., Levy S. and Rinvolucri M. (1996). Letters. Oxford: Oxford University Press.

MLA

Burbidge N, Gray P, Levy Sh and Rinvolucri M. Letters. Oxford: Oxford University Press. 1996.