Beukelman David R. Au. Augmentative & alternative communication supporting children and aults with complex communication needs - 5 Ed. - Baltimore Paul H. Brooks Publishing Co. 2020 - xv,686p. cm. ISBN: 9781681253039 (hbk) USD 89.95 Standard No.: 354,001 Source: 156, 22/12/2021, Mallika Books Textual Subjects--Topical Terms: PSYCHOLOGY Dewey Class. No.: S1:682, R0