APA (7th ed.) Citation

Humble, R. (1989). The age of Leif Eriksson. Franklin Watts.

Chicago Style (17th ed.) Citation

Humble, Richard. The Age of Leif Eriksson. London: Franklin Watts, 1989.

MLA (9th ed.) Citation

Humble, Richard. The Age of Leif Eriksson. Franklin Watts, 1989.

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