APA (7th ed.) Citation

Whitaker, I. (1981). The Problem of Pytheas' Thule.

Chicago Style (17th ed.) Citation

Whitaker, Ian. The Problem of Pytheas' Thule. 1981.

MLA (9th ed.) Citation

Whitaker, Ian. The Problem of Pytheas' Thule. 1981.

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