@Book{Friendly88,
author = {Michael Friendly},
title = {Advanced Logo: A Language for Learning},
year = {1988},
isbn = {0-89859-933-4},
publisher = {L. Erlbaum Associates},
address = {Hillsdale, NJ},
lccn = {QA76.73.L63 F75 1988},
url = {http://books.google.ca/books/about/Advanced_logo.html?id=zvF5wb12E0wC},
}