APA (7th ed.) Citation

Nature Conservancy (Great Britain), Ball, D. F., Mew, G., & Macphee, W. S. G. (1969). Soils of Snowdon. [publisher not identified].

Chicago Style (17th ed.) Citation

Nature Conservancy (Great Britain), Derrick Frank Ball, G. Mew, and W. S. G. Macphee. Soils of Snowdon. Bangor [Wales]: [publisher not identified], 1969.

MLA (9th ed.) Citation

Nature Conservancy (Great Britain), et al. Soils of Snowdon. [publisher not identified], 1969.