APA (7th ed.) Citation

Heppenstall, R. (1968). The connecting door. Dufour.

Chicago Style (17th ed.) Citation

Heppenstall, Rayner. The Connecting Door. [Chester Springs, Pa.]: Dufour, 1968.

MLA (9th ed.) Citation

Heppenstall, Rayner. The Connecting Door. Dufour, 1968.