Found 2 books

[en] Splunk 7 Essentials · 3rd Edition Packt Publishing

Contreras, J-p & Koelpin, Steven & Delgado, Erickson

[en] Splunk · Enterprise Operational Intelligence Delivered Packt Publishing

Sigman, Betsy Page & Delgado, Erickson & Diakun, Josh & Johnson, Paul R. & Mock, Derek