Books on Theory of Second Language Learning as an Adult

Been studying languages on my own for a few years now, I'm interested in learning more about the theory of language learning as an adult.

Does anyone have recommended sources that summarize modern theory/methods for learning a second language as an adult? Generally interested in understanding more about what metrics are generally considered relevant to define success, what the methods used are, etc. as a jumping off point to start reading some more recent primary literature on the subject. Textbooks with long bibliographies are ideal.

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