- Listenly
- Public Library
- Project Gutenberg
- Sterling, Madge (Fictitious character) — Juvenile fiction
Sterling, Madge (Fictitious character) — Juvenile fiction — Audiobooks
The Missing Formula
by Mildred A. (Mildred Augustine) Wirt
The Secret of the Sundial
by Mildred A. (Mildred Augustine) Wirt
The Deserted Yacht
by Mildred A. (Mildred Augustine) Wirt