Cita APA (7a ed.)

Byrne, R., & Hausner, H. (1981). Medieval period (Teacher's guide.). Holmes McDougall.

Cita Chicago Style (17a ed.)

Byrne, Robert, y Helen Hausner. Medieval Period. Teacher's guide. Edinburgh: Holmes McDougall, 1981.

Cita MLA (9a ed.)

Byrne, Robert, y Helen Hausner. Medieval Period. Teacher's guide. Holmes McDougall, 1981.