The two main textbooks for the course are:

• Introduction to Topology, by Gamelin and Greene.
• Topology, by K. Janisch.

These two textbooks cover essentially the same material as this course:

• Topology, by J. Munkres.
• A first course in Algebraic Topology, by C. Kosniewski

The following additional textbooks cover the same material with differing emphasis.

• Elementary Topology Problem Textbook by Viro, Ivanov, Netsvetaev and Kharlamov. A complete course based entirely on problems. Download here
• Basic Topology, by M.A. Armstrong.
• Topological Manifolds, by J. Lee.
• Principles of Topology by F. Croom.