APA استشهاد

Bjorn, L. O. Light and life. Hodder and Stoughton.

استشهاد بنمط شيكاغو

Bjorn, Lars Olof. Light and Life. London: Hodder and Stoughton.

MLA استشهاد

Bjorn, Lars Olof. Light and Life. Hodder and Stoughton.