APA (7th ed.) Citation

Bakos, G. A., & Tremko, J. Photometry and Spectroscopy of Gamma Herculis.

Chicago Style (17th ed.) Citation

Bakos, G. A., and Jozef Tremko. Photometry and Spectroscopy of Gamma Herculis.

MLA (9th ed.) Citation

Bakos, G. A., and Jozef Tremko. Photometry and Spectroscopy of Gamma Herculis.

Warning: These citations may not always be 100% accurate.