APA (7th ed.) Citation

Wabl, C., Markus, H., NADA, & PET. pk000281: Karl Marx.

Chicago Style (17th ed.) Citation

Wabl, Christian, Hans Markus, NADA, and PET. Pk000281: Karl Marx.

MLA (8th ed.) Citation

Wabl, Christian, et al. Pk000281: Karl Marx.