APA (7th ed.) Citation

Dierickx, H., & Hopkinson, A. (1981). Reference manual for machine readable bibliographic descriptions (2nd ed. rev.). Unesco.

Chicago Style (17th ed.) Citation

Dierickx, H., and A. Hopkinson. Reference Manual for Machine Readable Bibliographic Descriptions. 2nd ed. rev. Paris: Unesco, 1981.

MLA (9th ed.) Citation

Dierickx, H., and A. Hopkinson. Reference Manual for Machine Readable Bibliographic Descriptions. 2nd ed. rev. Unesco, 1981.