APA (7th ed.) Citation

Langley, M. (1972). When the Pole Star shone : a history of exploration / by M. Langley: A history of exploration. Harrap.

Chicago Style (17th ed.) Citation

Langley, M. When the Pole Star Shone : A History of Exploration / by M. Langley: A History of Exploration. Harrap, 1972.

MLA (9th ed.) Citation

Langley, M. When the Pole Star Shone : A History of Exploration / by M. Langley: A History of Exploration. Harrap, 1972.

Warning: These citations may not always be 100% accurate.