Cita APA

Porras Estrada, D. M. (1973). Mark Twain: His life and his work. Heredia: D.M. Porras.

Citación estilo Chicago

Porras Estrada, Daisy María. Mark Twain: His Life and His Work. Heredia: D.M. Porras, 1973.

Cita MLA

Porras Estrada, Daisy María. Mark Twain: His Life and His Work. Heredia: D.M. Porras, 1973.