APA (7th ed.) Citation

Burwell, C. G. (1950). Second supplement to the Mount Wilson catalogue and bibliography of stars of classes B and A whose spectra have bright hydrogen lines. Astrophysical Journal, 111, 666.

Chicago Style (17th ed.) Citation

Burwell, C. G. "Second Supplement to the Mount Wilson Catalogue and Bibliography of Stars of Classes B and A Whose Spectra Have Bright Hydrogen Lines." Astrophysical Journal 111 (1950): 666.

MLA (9th ed.) Citation

Burwell, C. G. "Second Supplement to the Mount Wilson Catalogue and Bibliography of Stars of Classes B and A Whose Spectra Have Bright Hydrogen Lines." Astrophysical Journal, vol. 111, 1950, p. 666.