APA (7th ed.) Citation

Clarke, B. L. (1972). Some recent research on cleaning external masonry in Great Britain.

Chicago Style (17th ed.) Citation

Clarke, B. L. Some Recent Research on Cleaning External Masonry in Great Britain. 1972.

MLA (9th ed.) Citation

Clarke, B. L. Some Recent Research on Cleaning External Masonry in Great Britain. 1972.

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