Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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