Cita APA (7a ed.)

Gladstone, W. E. (1944). The Puffin puzzle book. Penguin Books.

Cita Chicago Style (17a ed.)

Gladstone, W. E. The Puffin Puzzle Book. Harmondsworth, Middlesex: Penguin Books, 1944.

Cita MLA (9a ed.)

Gladstone, W. E. The Puffin Puzzle Book. Penguin Books, 1944.