APA (7th ed.) Citation

Stempel, D. A., Spahn, J. D., & González Valdepeña, H. Asma.

Chicago Style (17th ed.) Citation

Stempel, David A., Joseph D. Spahn, and Hugo González Valdepeña. Asma.

MLA (8th ed.) Citation

Stempel, David A., et al. Asma.

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