TY - BOOK ID - 6422599 TI - Educational research: readings in focus AU - Lehmann, Irvin J. AU - Mehrens, William A. PY - 1971 SN - 0030831407 9780030831409 PB - New York Holt, Rinehart and Winston DB - UniCat KW - Education KW - Research KW - Research. KW - Education - Research UR - https://www.unicat.be/uniCat?func=search&query=sysid:6422599 AB - ER -