APA
Johnson G. V., . (1990). Information systems. Omaha, Nebraska: Mountain Tep Publishing.
Chicago
Johnson G Vaughn, . 1990. Information systems. Omaha, Nebraska: Mountain Tep Publishing.
Harvard
Johnson G. V., . (1990). Information systems. Omaha, Nebraska: Mountain Tep Publishing.
MLA
Johnson G Vaughn, . Information systems. Omaha, Nebraska: Mountain Tep Publishing. 1990.