Wirtz, B. W. (2019). Digital business models: Concepts, models, and the Alphabet Case Study. Springer.
Lua i Stíl Chicago (17ú heag.)Wirtz, Bernd W. Digital Business Models: Concepts, Models, and the Alphabet Case Study. Cham, Switzerland: Springer, 2019.
Lua MLA (9ú heag.)Wirtz, Bernd W. Digital Business Models: Concepts, Models, and the Alphabet Case Study. Springer, 2019.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.