During the lecture on Tracer Hydrology given by professor Stefan Uhlenbrook some additional books are mentioned which thoroughly discuss the topic.

• Tracing techniques in geohydrology by W. Kaess. ISBN: 9054104449
• Isotope Tracers in Catchment Hydrology by C. Kendall and J. J. McDonnell. ISBN: 9780444501554
• Isotopes in the water cycle by P.K. Aggarwal, J.R. Gat and K.F.P. Foehlich. ISBN: 9781402030109
• Environmental isotopes in hydrology by I.D. Clark and P. Fritz. ISBN: 1566702496

These books can either be found in the library of an university or they can be bought on the Internet.