Mainframe

Lulu.com

What On Earth is a Mainframe?: An Introduction to IBM Z Mainframes and z/OS Operating System for Total Beginners

Lulu

What On Earth is a Mainframe?                    

O'Reilly

Modern Mainframe Development: Cobol, Databases, and Next-Generation Approaches

Robert Wingate

IBM Mainframe Developer Training and Reference Guide

Independently published

So You Want to Be a z/OS Systems Programmer?: The Fast Track to Understanding z/OS Like a Pro (IBM Mainframe Series)

Mastering REXX on z/OS: A Practical Guide to Automation, Scripting, and Problem Solving on the Mainframe (IBM Mainframe Series) (English Edition)

CREATESPACE

The Computer Guy Is Here!: Mainframe Mechanic    

Mike Murach

Murach's Mainframe COBOL                        

Rexx on z/OS: The Modern Mainframe Automation Handbook: Practical Scripting for TSO, ISPF, JCL, and z/OS UNIX (English Edition)

Mastering z/OS JCL: A Practical Guide to Job Control Language on the Mainframe (IBM Mainframe Series) (English Edition)