APA (7th ed.) Citation

Dryden I G C. (1968). SI units: SI and related units: quick-reference conversion factors. British Coal Utilisation Research Association.

Chicago Style (17th ed.) Citation

Dryden I G C. SI Units: SI and Related Units: Quick-reference Conversion Factors. Leatherhead: British Coal Utilisation Research Association, 1968.

MLA (8th ed.) Citation

Dryden I G C. SI Units: SI and Related Units: Quick-reference Conversion Factors. British Coal Utilisation Research Association, 1968.