"Open Sources: Voices from the Open Source Revolution" (1999), edited by Chris DiBona, Sam Ockman, and Mark Stone, is an anthology published by O'Reilly Media that assembles essays by the major figures of the free-vs-open-source-schism-1998-2007 era. It serves as a primary document of the open-source-definition-schism and the strategic and philosophical divergences that followed netscape-mozilla-open-source-1998.
The volume contains stallman's essay "The GNU Project" (also published as the-gnu-project-essay) — his own account of the announcement-of-gnu-project, the founding-of-fsf, and the development of the free-software-definition and copyleft. The inclusion of Stallman's essay alongside those of eric-raymond, linus-torvalds, and bruce-perens makes the book a useful document of the movement's internal disagreements: Stallman's piece insists on the software-freedom-vs-open-source distinction throughout, while the surrounding essays largely embrace the open-source-initiative's pragmatic framing.
The volume also contains an essay by christine-peterson recounting the coinage of the term "open source software" at the February 5, 1998 strategy session. This first-person account is a primary source for that pivotal moment.
Essays by Torvalds, Raymond, Perens, and others sketch the technical, strategic, and commercial arguments for the open source approach. Read against stallman's contribution, the anthology documents exactly the divergence stallman describes in why-open-source-misses-the-point: the other contributors emphasize development methodology, business models, and technical quality, while Stallman emphasizes freedom as an ethical requirement.
tim-oreilly's publishing house produced the book, making it itself a document of O'Reilly's role in promoting the open source framing — a role Stallman has noted in his ongoing distinction between the "open source" and "free software" movements. The book is widely available and represents the open source camp's self-understanding at the moment of the schism's crystallization. For understanding stallman's position within the movement he founded, reading his essay in this anthology alongside those of the other contributors is illuminating in ways that reading either in isolation would not be.