APA (7th ed.) Citation

Haynes, K. E., & Fotheringham, A. S. (1984). Gravity and spatial interaction models. Sage.

Chicago Style (17th ed.) Citation

Haynes, Kingsley E., and A. Stewart Fotheringham. Gravity and Spatial Interaction Models. Beverly Hills: Sage, 1984.

MLA (9th ed.) Citation

Haynes, Kingsley E., and A. Stewart Fotheringham. Gravity and Spatial Interaction Models. Sage, 1984.