A complete course. Another book that would be worth reading all the way through at some point in your studies.
Peter Ladefoged & Keith Johnson “A course in phonetics”, 2014, Wadsworth Publishing, 7th edition, ISBN 978-1285463407
ebook available from the University library
Ladefoged & Johnson - A course in phonetics – Chapter 8 – Acoustic phonetics
Links the source-filter model to spectrograms and acoustic analysis of speech.