APA (7th ed.) Citation

Merton, T. R., & Nicholson, J. W. (1917). On phenomena relating to the spectra of hydrogen and helium.

Chicago Style (17th ed.) Citation

Merton, T. R., and John William Nicholson. On Phenomena Relating to the Spectra of Hydrogen and Helium. London, 1917.

MLA (8th ed.) Citation

Merton, T. R., and John William Nicholson. On Phenomena Relating to the Spectra of Hydrogen and Helium. 1917.