American Universities Field Staff, California Institute of Technology. Population Program, Brown, H., & Sweezy, A. R. (1973). Population: Perspective, 1973. Freeman.
Dyfyniad Arddull ChicagoAmerican Universities Field Staff, California Institute of Technology. Population Program, Harrison Brown, and Alan Richardson Sweezy. Population: Perspective, 1973. San Francisco: Freeman, 1973.
Dyfyniad MLAAmerican Universities Field Staff, et al. Population: Perspective, 1973. Freeman, 1973.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.