APA (7th ed.) Citation

Schmidt, J. B., Lindmaier, A., & Spona, J. Endocrine Parameters in Acne Vulgaris.

Chicago Style (17th ed.) Citation

Schmidt, J. B., A. Lindmaier, and J. Spona. Endocrine Parameters in Acne Vulgaris.

MLA (9th ed.) Citation

Schmidt, J. B., et al. Endocrine Parameters in Acne Vulgaris.