Deep Learning, Ian Goodfellow, Yoshua Bengio, and Aaron Courville, 2016 (MIT Press) - This textbook details the architecture of recurrent neural networks, covering their structure, computations, and the concept of unrolling through time.
Finding structure in time, Jeffrey L. Elman, 1990Cognitive Science, Vol. 14 (Wiley)DOI: 10.1207/s15516709cog1402_1 - This paper introduces the simple recurrent network, an early and influential model for processing sequential information.