Found 3 books

Real World OCaml (Beta 2, Community Edition)

[en] Real World OCaml (Beta 2, Community Edition) O'Reilly Media

Yaron Minsky, Anil Madhavapeddy, Jason Hickey

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Real World OCaml

[en] Real World OCaml O'Reilly Media, Inc.

Hickey, Jason & Madhavapeddy, Anil & Minsky, Yaron

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Real World OCaml · Functional programming for the masses

[en] Real World OCaml · Functional programming for the masses O'Reilly Media

Minsky, Yaron & Madhavapeddy, Anil & Hickey, Jason

download read it!