If you find you or your students need a textbook resource, please check out this book:

http://publicspeakingproject.org/

This is free and open to the public, and wonderful for all lower-level communication courses. 

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If you would like a free and open business communication textbook, I highly recommend the open sources business communication book from the University of Minnesota:

https://open.lib.umn.edu/businesscommunication/

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