IP telephony using CallManager express lab portfolio

by Schmidt, Cheryl A.
Published 2007

Complete CompTIA A+ guide to IT hardware and software

by Schmidt, Cheryl A.
Published 2016

Complete A+ guide to IT hardware and software : a CompTIA A+ Core 1 (220-1101) & CompTIA A+ Core 2 (110-1̀102) textbook

by Schmidt, Cheryl A., Lee, Christopher A.
Published 2022