TIM-7020: v5

Watt, A. (2014). Database design (2nd ed.). Open Textbook Library
Chapter 8 of this open-source textbook provides definitions and explanations of entity-relationship diagrams.

Springer (Producer). (2019). Introducing SQL and relational databases [Video/DVD]. Apress.
Lesson 4 of this video series provides an overview of data modeling and the ER model.

Harrington, J. L. (2016). Relational database design and implementation, (4th ed.). Morgan Kaufman. Read Chapter 4 Entities and Relationships

Hingorani, K., Gittens, D., & Edwards, N. (2017). Reinforcing Database Concepts by Using Entity Relationships Diagrams (Erd) and Normalization Together for Designing Robust Databases. Issues in Information Systems, 18(1), 202–209.
This website provides information on ERDs and relationship types.