TY - RPRT TI - Reading grade level adjustment and auditory supplementation as techniques for increasing textual comprehensibility. AU - A I Siegel AU - M R Lautman AU - J R Burkett PY - 1974 DO - 10.1037/h0021533 UR - https://pubmed.ncbi.nlm.nih.gov/4443475/ ID - 4443475 ER -