Credit: Dr. Brownlee at machinelearningmastery.com

1. How to Clean Text for Machine Learning with Python: https://machinelearningmastery.com/clean-text-machine-learning-python/
2. How to Develop a Deep Learning Bag-of-Words Model for Predicting Movie Review Sentiment: https://machinelearningmastery.com/deep-learning-bag-of-words-model-sentiment-analysis/
3. How to Prepare Text Data for Machine Learning with scikit-learn: https://machinelearningmastery.com/prepare-text-data-machine-learning-scikit-learn/