APA (7th ed.) Citation

Xu, K., Das, K. C., & Trinajstić, N. (2015). The harary index of a graph. Springer.

Chicago Style (17th ed.) Citation

Xu, Kexiang, Kinkar Ch Das, and Nenad Trinajstić. The Harary Index of a Graph. Heidelberg [Germany]: Springer, 2015.

MLA (9th ed.) Citation

Xu, Kexiang, et al. The Harary Index of a Graph. Springer, 2015.