APA (7th ed.) Citation

Arnar, D. O., & Andersen, K. (2009). Title Page / Table of Contents. Cardiology, 113, I. https://doi.org/10.1159/000223364

Chicago Style (17th ed.) Citation

Arnar, David O., and Karl Andersen. "Title Page / Table of Contents." Cardiology 113 (2009): I. https://doi.org/10.1159/000223364.

MLA (9th ed.) Citation

Arnar, David O., and Karl Andersen. "Title Page / Table of Contents." Cardiology, vol. 113, 2009, p. I, https://doi.org/10.1159/000223364.