Reference should use the Markdown . (period) : (colon) syntax.
Code Block
[1]. Smith, Samuel M., Meta-Platforms and Cooperative Network-of-Networks Effects: Why Decentralized Platforms Will Eat Centralized Platforms. 2019/03/25 https://medium.com/selfrule/meta-platforms-and-cooperative-network-of-networks-effects-6e61eb15c586
[1]: https://medium.com/selfrule/meta-platforms-and-cooperative-network-of-networks-effects-6e61eb15c586