Cita APA (7a ed.)

Gessford, J. E. (1980). Modern information systems; designed for decision support. Addison-Wesley publishing company.

Cita Chicago Style (17a ed.)

Gessford, John Evans. Modern Information Systems; Designed for Decision Support. Reading: Addison-Wesley publishing company, 1980.

Cita MLA (8a ed.)

Gessford, John Evans. Modern Information Systems; Designed for Decision Support. Addison-Wesley publishing company, 1980.