Cita APA (7th ed.)
Hopkinson, A. (1981). Reference Manual for machine-readable bibliographic descriptions.
Cita Chicago (17th ed.)
Hopkinson, Alan. Reference Manual for Machine-readable Bibliographic Descriptions. 1981.
Cita MLA (9th ed.)
Hopkinson, Alan. Reference Manual for Machine-readable Bibliographic Descriptions. 1981.
Atenció: Aquestes cites poden no estar 100% correctes.