 Stellar Structure and Evolution by Onno Pols

Primary text: www.astro.ru.nl/~onnop/education/stev_utrecht_notes/chapter1-4.pdf

Author course site: www.astro.ru.nl/~onnop/education/stev_utrecht_notes/

Cited passage: Section 3.4, printed pp. 33–35, especially the footnote on p. 34 defining the three adiabatic exponents and their relation. Utrecht lecture notes; the author and September 2011 date appear on the title page.