Deep Learning, Ian Goodfellow, Yoshua Bengio, and Aaron Courville, 2016 (MIT Press) - A standard textbook that covers recurrent neural networks, including an explanation of bidirectional variants, providing foundational theoretical background.
tf.keras.layers.Bidirectional, TensorFlow Developers, 2024 - Official documentation detailing the usage, parameters, and behavior of the Bidirectional wrapper for Keras recurrent layers.
torch.nn.GRU, PyTorch Developers, 2024 (PyTorch Foundation) - Official documentation describing the GRU module in PyTorch, including the bidirectional parameter and its impact on the layer's output.