For learning differential forms with a calculus background similar to Spivak's, several textbooks are recommended. Spivak's "Calculus on Manifolds" is a popular choice, though it is brief. Edwards' "Advanced Calculus of Several Variables" is suggested as a more accessible alternative. For a deeper understanding of differential forms in general manifolds, John Lee's and do Carmo's texts are highly regarded, along with Lang's and Abraham/Marsden's books. The discussion highlights the importance of the reader's goals, noting that some books focus more on analytical aspects while others emphasize topology. A distinction is made between two authors named Edwards, clarifying their different approaches to advanced calculus. Additionally, Spivak's "A Comprehensive Introduction to Differential Geometry" is mentioned as a follow-up after "Calculus on Manifolds." Overall, the conversation emphasizes the variety of resources available, catering to different learning preferences and levels of rigor.