Hydraulics is an essential part in mechanical engineering and it's required too every engineer to know information about it; it'll be very useful in job interviews, career, study or graduation projects; so in the next link you'll find some references and books about hydraulics and hydraulic circuit will be useful to your engineering knowledge.

you'll find these references and books:

*Rexroth data.
*festo data.
*references.

[link Point to another website Only the registered members can access]