APA (7th ed.) Citation

Unwin, D. (1975). An introduction to trend surface analysis. Geo Abstracts Ltd.

Chicago Style (17th ed.) Citation

Unwin, D. An Introduction to Trend Surface Analysis. Norwich: Geo Abstracts Ltd, 1975.

MLA (9th ed.) Citation

Unwin, D. An Introduction to Trend Surface Analysis. Geo Abstracts Ltd, 1975.

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