APA (7th ed.) Citation

Garcia, A., Sobotka, M., Klvaňa, M., & Bumba, V. Synoptic observations with the Coimbra spectroheliograph.

Chicago Style (17th ed.) Citation

Garcia, A., M. Sobotka, M. Klvaňa, and Václav Bumba. Synoptic Observations with the Coimbra Spectroheliograph.

MLA (9th ed.) Citation

Garcia, A., et al. Synoptic Observations with the Coimbra Spectroheliograph.

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