Cita APA (7a ed.)

Engel, J., & Prince, I. (1997). The complete allergy book. Key Porter Books.

Cita Chicago Style (17a ed.)

Engel, June, y Isolde Prince. The Complete Allergy Book. Toronto: Key Porter Books, 1997.

Cita MLA (9a ed.)

Engel, June, y Isolde Prince. The Complete Allergy Book. Key Porter Books, 1997.