The route of the Tram 28, with all the stops, and sights to see along the way. More info here: https://www.timetravelturtle.com/tram-28-lisbon -portugal/
Lisbon's Tram 28E: Everything You Need to Know [+ map]
Best stops on Tram 28 Lisbon - Vagabond Buddha
Lisbon Tram Route 15 | Portugal Travel Guide
Lisbon Tram - Routes, hours, fares & maps of the trams in Lisbon
The development of Lisbon's tram track network
Lisbon Tram thoroughly capturing! Route maps, Congestion avoidance methods, etc.
Getting Around Lisbon Lisbon Transport: Lisbon by metro, bus, tram, taxi and bike
The best spots along Lisbon's Tram №28 — Aperture Tours