Cita APA (7th ed.)

Duffus, R. L. (1930). Books: Their place in a democracy. Houghton Mifflin company.

Cita Chicago (17th ed.)

Duffus, R. L. Books: Their Place in a Democracy. Boston: Houghton Mifflin company, 1930.

Cita MLA (8th ed.)

Duffus, R. L. Books: Their Place in a Democracy. Houghton Mifflin company, 1930.