7 1 10 dAVIS, r Primary Author Bull, C Primary Author Roscoe, J Primary Author Roscoe, D Primary Author mixed material 0723415714 Wolfe Pulishing Ltd an approach to the improvement of intruction Davis, Robert H Primary Author mixed material New York McGraw Hill 1974 SINAGA, Herman [ed.] Additional Author STONE, Jeffrey Allen Joseph Additional Author KELLY, Maureen Anne Teresa Additional Author DAVIS, Richard Glen Michael Additional Author NAHAR, Dominikus [penerj.] Additional Author mixed material 9789790334687 Jakarta Erlangga 1984 JOHNSON, Palmer O Additional Author DAVIS, Robert A Additional Author BARR, Arvil S Primary Author mixed material Chicago J.B. Lippincott 1953 DAVIS, Ronald H Primary Author mixed material New York McGraw-Hill 1999 DAVIS, Rick Primary Author mixed material 9781843155058 Letts DAVIS, Richard T. Primary Author mixed material New York Prentice hall inc. 1962