Cita APA (7a ed.)

Portfolio, T. (1989). Pro*COBOL supplement to the ORACLE precompilers guide: Version 1.3. Oracle.

Cita Chicago Style (17a ed.)

Portfolio, Tom. Pro*COBOL Supplement to the ORACLE Precompilers Guide: Version 1.3. Chertsey, Surrey: Oracle, 1989.

Cita MLA (9a ed.)

Portfolio, Tom. Pro*COBOL Supplement to the ORACLE Precompilers Guide: Version 1.3. Oracle, 1989.