Graph Databases by Ian Robinson, Emil Eifrem, Jim Webber
Graph Data Model
https://www.oreilly.com/library/view/graph-databases/9781449356255/ch01.html
Graph Databases:
https://www.oreilly.com/library/view/graph-databases/9781449356255/ch01.html
Neo4j: A leader in Graph Databases
https://neo4j.com/
Learn Neo4j
https://neo4j.com/docs/