Pratt, B., & Loizos, P. (1992). Choosing research methods: Data collection for development workers. Oxfam.
Dyfyniad Arddull ChicagoPratt, Brian, and Peter Loizos. Choosing Research Methods: Data Collection for Development Workers. Oxford: Oxfam, 1992.
Dyfyniad MLAPratt, Brian, and Peter Loizos. Choosing Research Methods: Data Collection for Development Workers. Oxfam, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.