A detailed explanation of what plurality is that describes several ways it can be experienced along a spectrum of dissociation. While this is primarily aimed at disordered plurality and a clinical framework, it does note the existence of other forms of plurality.
An older website explaining soulbonding. It's a good place to start learning about that considering that the soulbonding community has practically vanished into the plural community.
One of the earliest websites about median plurality- it actually predates the coining of the word median and uses its predecessor, midcontinuum. Contains quite a few links to anecdotal experiences of medianhood.
An explanation of median plurality with an example from the author. Fair warning that Astraea's Web itself is a horrible resource and is known for stealing the work of creators without their permission; this is practically the only page we can recommend from that site and that's only because we can't find it elsewhere.
An essay aimed at DID and OSDD systems that are struggling with doubt and denial. While it is aimed explicitly at DID and OSDD, some aspects of it could be helpful for nondisordered systems.
A large number of essays written by LB Lee on various topics including plural history, relationships, memory work, and more. We'd highly recommend their memory work essays in particular.
A set of four articles on plurality and tulpamancy in particular. A very useful read for tulpamancers or those interested in exploring their system structure.
A zine about plural selves within singlets from an Internal Family Systems perspective. It proposes that everyone has plural selves, but that they manifest more subtly for most people. Even if you disagree with the idea, it's an interesting read.
A helpful set of questions for plurals to fill out to explain how they want others to interact with them. If you're not plural, these may be some good questions to ask your plural friends if you don't know the answers.
A speculative paper on the nature of the self, theorizing that the self is the center of the story we tell about ourselves. Towards the end, it touches on plurality and notes that there's no reason one couldn't unproblematically have multiple selves.