Reddit mentions of Bridge to Twentieth-Century Music: A Programed Course (Revised Edition)

Part 1

https://www.amazon.com/Harmonic-Materials-Tonal-Music-Programmed/dp/0205629717/ref=pd_sbs_14_1/132-1931752-2639066?_encoding=UTF8&pd_rd_i=0205629717&pd_rd_r=07bf0802-67a9-4bd7-959b-c29b8a462315&pd_rd_w=7pxDw&pd_rd_wg=7Y6o3&pf_rd_p=588939de-d3f8-42f1-a3d8-d556eae5797d&pf_rd_r=A5YH2NY8B0BJRFE2X6DT&psc=1&refRID=A5YH2NY8B0BJRFE2X6DT

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Part 2

https://www.amazon.com/Harmonic-Materials-Tonal-Music-Programmed/dp/020562975X/ref=sr_1_2?keywords=harmonic+materials&link_code=qs&qid=1563943772&s=gateway&sourceid=Mozilla-search&sr=8-2

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Bridge to 20th century

https://www.amazon.com/Bridge-Twentieth-Century-Music-Programed-Revised/dp/0205287581/ref=sr_1_9?qid=1563943844&refinements=p_27%3AGreg+A.+Steinke&s=books&sr=1-9&text=Greg+A.+Steinke

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They have a "Part 0". I have a feeling you might be able to start with Part 2 and skip Part 0 and Part 1, but I can't be sure.

These are the books I used to build my foundation and I loved them. I just found the titles, but you might want to make sure you get the latest editions. Get the CD that comes with it as well.

These will probably get you into the intermediate stage, but I've never really been able to quantify where that stage begins and ends.

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I'm just sharing what I know as a good foundation. It really isn't in the jazz realm of music theory. Classical and Jazz are similar but also very different. Best to learn both. Classical is probably better to begin with, as you've already started with it.