Παραπομπή σε μορφή APA (7η εκδ.)

Walker, R. L. Urban sub-areas as sampling frameworks: A further development. Town Planning Review.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Walker, Robert L. "Urban Sub-areas as Sampling Frameworks: A Further Development." Town Planning Review .

Παραπομπή σε μορφή MLA (9th εκδ.)

Walker, Robert L. "Urban Sub-areas as Sampling Frameworks: A Further Development." Town Planning Review, .