[O] Citation syntax: Underscore MUST(?) be allowed in cite keys?

[Vaidheeswaran C]

1. Visit http://www.amazon.in/How-Read-Book-Touchstone-book/dp/0671212095
2. Add it to Zotero.
3. Export My Library to BibTeX format.
4. The attached file -- My Library 1.bib -- is what I get.

When I import the above .bib file to JabRef GUI, the keys that are
reported are \cite{adler_how_1972},
\cite{center_for_history_and_new_media_zotero_????}.

I am a novice comes to citation.  I had a vague impression by that `_'
is not allowed in cite keys.  If we go this way, then the above
workflow will be a nightmare.


@misc{center_for_history_and_new_media_zotero_????,
	title = {Zotero {Quick} {Start} {Guide}},
	url = {http://zotero.org/support/quick_start_guide},
	author = {{Center for History and New Media}},
	annote = {Welcome to Zotero!View the Quick Start Guide to learn how to begin collecting, managing, citing, and sharing your research sources.Thanks for installing Zotero.}
}

@book{adler_how_1972,
	address = {New York},
	edition = {Revised edition edition},
	title = {How to {Read} a {Book}},
	isbn = {9780671212094},
	abstract = {With half a million copies in print, How to Read a Book is the best and most successful guide to reading comprehension for the general reader, completely rewritten and updated with new material.Originally published in 1940, this book is a rare phenomenon, a living classic that introduces and elucidates the various levels of reading and how to achieve them—from elementary reading, through systematic skimming and inspectional reading, to speed reading. Readers will learn when and how to “judge a book by its cover,” and also how to X-ray it, read critically, and extract the author’s message from the text.Also included is instruction in the different techniques that work best for reading particular genres, such as practical books, imaginative literature, plays, poetry, history, science and mathematics, philosophy and social science works.Finally, the authors offer a recommended reading list and supply reading tests you can use measure your own progress in reading skills, comprehension, and speed.},
	language = {English},
	publisher = {Simon \& Schuster},
	author = {Adler, Mortimer J. and Doren, Charles Van},
	month = aug,
	year = {1972}
}