APA (7th ed.) Citation

McKinnon, J. A., & Waldmeier, M. (1987). Sunspot numbers, 1610-1985: Based on "The sunspot activity in the years 1610-1960". World Data Center A for Solar-Terrestrial Physics.

Chicago Style (17th ed.) Citation

McKinnon, John A., and Max Waldmeier. Sunspot Numbers, 1610-1985: Based on "The Sunspot Activity in the Years 1610-1960". Boulder, Colorado: World Data Center A for Solar-Terrestrial Physics, 1987.

MLA (9th ed.) Citation

McKinnon, John A., and Max Waldmeier. Sunspot Numbers, 1610-1985: Based on "The Sunspot Activity in the Years 1610-1960". World Data Center A for Solar-Terrestrial Physics, 1987.