APA

(1971). Economic survey methods. [Ann Arbor: Survey Research Center, University of Michigan].

Chicago

1971. Economic survey methods. [Ann Arbor: Survey Research Center, University of Michigan].

Harvard

(1971). Economic survey methods. [Ann Arbor: Survey Research Center, University of Michigan].

MLA

Economic survey methods. [Ann Arbor: Survey Research Center, University of Michigan]. 1971.