APA (7th ed.) Citation

Illingworth, S. R. (1921). The analysis of coal and its by-products. Colliery Guardian Co.

Chicago Style (17th ed.) Citation

Illingworth, S. Roy. The Analysis of Coal and Its By-products. London: Colliery Guardian Co, 1921.

MLA (9th ed.) Citation

Illingworth, S. Roy. The Analysis of Coal and Its By-products. Colliery Guardian Co, 1921.