G.L. · G. Langley · Graham-l
Intertec Pub Corp/Telephony · Pearson Education
| title | ISBN-13 | year of publication |
|---|---|---|
| International Dictionary of Telecommunications | 978-0-273-02669-3 | 1986 |
| Telecommunications Primer | 978-0-273-03187-1 | 1990 |
| Telecommunications Primer | 978-0-273-02478-1 | 1986 |
| Telecommunications Primer | 978-0-273-01980-0 | 1983 |
| Telephony's Dictionary | 978-0-917845-04-8 | 1986 |