Cita APA (7a ed.)

Fisher, D., & Day, J. (1963). Graded comprehension for advanced students.

Cita Chicago Style (17a ed.)

Fisher, David, y James Day. Graded Comprehension for Advanced Students. London, 1963.

Cita MLA (9a ed.)

Fisher, David, y James Day. Graded Comprehension for Advanced Students. 1963.