Dyfyniad APA

Utgard, R. O., McKenzie, G. D., & Foley, D. (1978). Geology in the urban environment. Burgess Pub. Co.

Dyfyniad Arddull Chicago

Utgard, Russell O., Garry D. McKenzie, and Duncan Foley. Geology in the Urban Environment. Minneapolis: Burgess Pub. Co, 1978.

Dyfyniad MLA

Utgard, Russell O., et al. Geology in the Urban Environment. Burgess Pub. Co, 1978.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.