Gould, S. B., & Cross, K. P. (1972). Explorations in non-traditional study ([1st ed.].). Jossey-Bass.
Dyfyniad Arddull ChicagoGould, Samuel B., and K. Patricia Cross. Explorations in Non-traditional Study. [1st ed.]. San Francisco: Jossey-Bass, 1972.
Dyfyniad MLAGould, Samuel B., and K. Patricia Cross. Explorations in Non-traditional Study. [1st ed.]. Jossey-Bass, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.