Παραπομπή σε μορφή APA (7η εκδ.)

Birkhead, T. R. (1991). The magpies: The ecology and behaviour of black-billed and yellow-billed magpies. T & AD Poyser.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Birkhead, T. R. The Magpies: The Ecology and Behaviour of Black-billed and Yellow-billed Magpies. London: T & AD Poyser, 1991.

Παραπομπή σε μορφή MLA (9th εκδ.)

Birkhead, T. R. The Magpies: The Ecology and Behaviour of Black-billed and Yellow-billed Magpies. T & AD Poyser, 1991.