APA引文

Ruggieri, D. D. (1969). Secrets of the sky. Hamlyn.

Chicago Edition Citation

Ruggieri, Deryck D. Secrets of the Sky. London: Hamlyn, 1969.

MLA引文

Ruggieri, Deryck D. Secrets of the Sky. Hamlyn, 1969.

警告：这些引文格式不一定是100％准确.