APA (7th ed.) Citation

Gwyn, D. (1999). Power systems in four Gwynedd slate quarries.

Chicago Style (17th ed.) Citation

Gwyn, David. Power Systems in Four Gwynedd Slate Quarries. 1999.

MLA (9th ed.) Citation

Gwyn, David. Power Systems in Four Gwynedd Slate Quarries. 1999.

Warning: These citations may not always be 100% accurate.