APA

Roll No. 40, University of Delhi. Faculty of Education. Department of Education & University of Delhi. Faculty of Education. Department of Education. (1972). Investigation into problems faced by the principals of Higher Secondary Schools in improving instruction. : .

Chicago

Roll No. 40, University of Delhi. Faculty of Education. Department of Education and University of Delhi. Faculty of Education. Department of Education. 1972. Investigation into problems faced by the principals of Higher Secondary Schools in improving instruction. : .

Harvard

Roll No. 40, University of Delhi. Faculty of Education. Department of Education and University of Delhi. Faculty of Education. Department of Education. (1972). Investigation into problems faced by the principals of Higher Secondary Schools in improving instruction. : .

MLA

Roll No. 40, University of Delhi. Faculty of Education. Department of Education and University of Delhi. Faculty of Education. Department of Education. Investigation into problems faced by the principals of Higher Secondary Schools in improving instruction. : . 1972.