Gambit Publications Limited - My Secrets in the Ruy Lopez

Mastering the Chess Openings Volume 2 (Paperback)

Chess Openings Online - Chessable

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My Secrets in the Ruy Lopez by Portisch, Lajos

The Marshall Gambit by Edward Winter

Why has Ruy Lopez, a chess opening, been so popular for so long? - Quora

Caruana's Ruy Lopez: A White Repertoire for Club Players by Fabiano Caruana

Warning: this book is not just entertainment. The author wants to teach you a lot about chess and improve the quality of your play! He has selected 50

Instructive Chess Miniatures