Cita APA (7a ed.)

Valdés, M. J., Unamuno, M. d., & Valdés, M. E. (1973). An Unamuno source book: : A catalogue of readings and acquisitions with an introductory essay on Unamuno's dialectical enquiry. University of Toronto.

Cita Chicago Style (17a ed.)

Valdés, Mario J., Miguel de Unamuno, y María Elena Valdés. An Unamuno Source Book: : A Catalogue of Readings and Acquisitions with an Introductory Essay on Unamuno's Dialectical Enquiry. Toronto: University of Toronto, 1973.

Cita MLA (9a ed.)

Valdés, Mario J., et al. An Unamuno Source Book: : A Catalogue of Readings and Acquisitions with an Introductory Essay on Unamuno's Dialectical Enquiry. University of Toronto, 1973.