Cita APA

Purkis, J. (1973). Where angels fear to tread. Open Univ.Press.

Chicago Edition Citation

Purkis, John. Where Angels Fear to Tread. Walton Hall: Open Univ.Press, 1973.

Cita MLA

Purkis, John. Where Angels Fear to Tread. Open Univ.Press, 1973.

Atenció: Aquestes cites poden no estar 100% correctes.