These are all the books I have found online about learning salsa piano. I started off by buying Salsa Piano - The Complete Guide. I think that is a good start, it's fairly short and comes with online access to examples. I've learned that Salsa Piano is usually studied in the context of a band setting, and the band revolves around clave patterns. So backing tracks and audio examples are an important learning asset in the Salsa genre.

After I'm done working through Salsa Piano - The Complete Guide I plan to dig into Beyond Salsa Piano Book Series by Kevin Moore. Beyond Salsa is an extensive library of books for learning salsa music on various instruments.

Salsa Piano - The Complete Guide
Beyond Salsa Piano Book Series
101 Montunos
Salsa Guidebook: For Piano and Ensemble
Salsa, Further Adventures In Afro Cuban Music For Piano
Cuban Masters Series: Piano
Afro-Cuban Keyboard Grooves
Salsa & Afro Cuban Montunos for Piano
Decoding Afro-Cuban Jazz: The Music of Chucho Valdes
Brazilian and Afro-Cuban Jazz Conception