Freedman, R. L. H. (1994). Open-ended questioning: A handbook for educators. Addison-Wesley.
Dyfyniad Arddull ChicagoFreedman, Robin Lee Harris. Open-ended Questioning: A Handbook for Educators. Menlo Park, Calif: Addison-Wesley, 1994.
Dyfyniad MLAFreedman, Robin Lee Harris. Open-ended Questioning: A Handbook for Educators. Addison-Wesley, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.