APA (7th ed.) Citation

Merrill, P. W. (1921). Observations of the nebular lines in the spectrum of the long-period variable star R Aquarii: By Paul W. Merrill. s.t.

Chicago Style (17th ed.) Citation

Merrill, Paul W. Observations of the Nebular Lines in the Spectrum of the Long-period Variable Star R Aquarii: By Paul W. Merrill. Washington: s.t, 1921.

MLA (9th ed.) Citation

Merrill, Paul W. Observations of the Nebular Lines in the Spectrum of the Long-period Variable Star R Aquarii: By Paul W. Merrill. s.t, 1921.