APA (7th ed.) Citation

Lea, J. (1988). The Hilldrop environmental improvement survey. The Hilldrop environmental improvement survey.

Chicago Style (17th ed.) Citation

Lea, John. "The Hilldrop Environmental Improvement Survey." The Hilldrop Environmental Improvement Survey 1988.

MLA (8th ed.) Citation

Lea, John. "The Hilldrop Environmental Improvement Survey." The Hilldrop Environmental Improvement Survey, 1988.

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