APA

Harper (Edwin A) ;Harper (Erika S), . (1990). Preparing Objective Examinations. : .

Chicago

Harper (Edwin A) ;Harper (Erika S), . 1990. Preparing Objective Examinations. : .

Harvard

Harper (Edwin A) ;Harper (Erika S), . (1990). Preparing Objective Examinations. : .

MLA

Harper (Edwin A) ;Harper (Erika S), . Preparing Objective Examinations. : . 1990.