APA (7th ed.) Citation

Hadady, R. E. (1984). Historical commodity spread charts: 830 years of spread charts covering 116 spreads in 19 commodities. Key Books Press.

Chicago Style (17th ed.) Citation

Hadady, R. Earl. Historical Commodity Spread Charts: 830 Years of Spread Charts Covering 116 Spreads in 19 Commodities. Pasadena, Calif.: Key Books Press, 1984.

MLA (9th ed.) Citation

Hadady, R. Earl. Historical Commodity Spread Charts: 830 Years of Spread Charts Covering 116 Spreads in 19 Commodities. Key Books Press, 1984.