Cita APA (7a ed.)

Schonell, F. J., & Nickless, W. (1978). The Happy venture playbooks (First published 1951, re-illustrated 1962, rev. ed. 1971, 5th impression.). Oliver and Boyd.

Cita Chicago Style (17a ed.)

Schonell, Fred J., y Will Nickless. The Happy Venture Playbooks. First published 1951, re-illustrated 1962, rev. ed. 1971, 5th impression. Edinburgh: Oliver and Boyd, 1978.

Cita MLA (9a ed.)

Schonell, Fred J., y Will Nickless. The Happy Venture Playbooks. First published 1951, re-illustrated 1962, rev. ed. 1971, 5th impression. Oliver and Boyd, 1978.