Mann, Peter H. Methods of social investigation / Peter H. Mann. - 2nd ed / . - Oxford : Basil Blackwell , 1985. - viii,222p. : ill.,pictuers ; 22cm . NULL ISBN: 0631140190 UKP 12.50 Subjects--Index Terms: SOCIOLOGY-RESERCH Dewey Class. No.: 301.072 / MAN/M