Cita APA (7th ed.)

Freeman, B. C. (1978). Two-thumb thomas. Puffin Books.

Cita Chicago (17th ed.)

Freeman, Barbara C. Two-thumb Thomas. Harmondsworth: Puffin Books, 1978.

Cita MLA (9th ed.)

Freeman, Barbara C. Two-thumb Thomas. Puffin Books, 1978.