Introduction to Linear Algebra, Gilbert Strang, 2016 (Wellesley-Cambridge Press) - 5th edition, a widely recognized textbook providing fundamental definitions and properties of matrices.
Deep Learning, Ian Goodfellow, Yoshua Bengio, and Aaron Courville, 2016 (MIT Press) - Chapter 2: Linear Algebra, presents matrices and their applications in machine learning contexts.
18.06SC Linear Algebra, Gilbert Strang, 2011 (MIT OpenCourseWare) - Course materials from MIT OpenCourseWare, covering essential linear algebra, including matrix structure and uses.
NumPy user guide: Arrays, NumPy Developers, 2023 - Official documentation explaining the fundamental ndarray object, its creation, and indexing, relevant for implementing matrices in Python.