The topic of 'Sourcing' is not directly covered in the provided podcast episodes, which focus on true crime and interior design. However, there are some tangential connections that can be made.

In the 'Rewind with Karen & Georgia - Episode 1: My Firstest Murder' episode, the importance of properly sourcing case details from journalists and true crime writers is discussed as a key lesson. This speaks to the broader concept of sourcing credible information, which is crucial in the true crime genre.

The 'Revisionist History LIVE with Nate Berkus' episode touches on Berkus's approach to sourcing unique, vintage, and handcrafted items to bring character and history to a space, which relates to the topic of product sourcing in the context of interior design.