APA
Pickering G., . (1967). The challenge to education. Harmondsworth: Penguin Books.
Chicago
Pickering George, . 1967. The challenge to education. Harmondsworth: Penguin Books.
Harvard
Pickering G., . (1967). The challenge to education. Harmondsworth: Penguin Books.
MLA
Pickering George, . The challenge to education. Harmondsworth: Penguin Books. 1967.
