Paperback
ISBN: 978-0-906717-18-9
ISBN-10: 0-906717-18-3
Language Teaching Publications · 1981
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| 2014 | MP3 CD | Partners |
| 2011 | Paperback | partners |
| 2010 | Paperback | Partners |
| 2005 | Paperback | Partners |
| 2004 | Hardcover | Partners |
| 2001 | Hardcover | Partners |
| 1999 | Paperback | Partners |
| 1988 | Paperback | Partners |
| 1985 | Mass Market Paperback | Partners |
| 1984 | Hardcover | Partners |
| 1975 | Paperback | Partners |