I got it right, but I don't like the question.

The QotD should be about testing our knowledge of SQL Server. Not testing our ability to use a search engine. And please don't tell me I've cheated by using one - how relevant is it that I do not recognise the paper from just the quote, or that I do not remember off the top of my head when it was published?

I do thank Tom for the effort of posting a QotD, and about a very important (and often overlooked) issue as well - but next time, please come up with a question about what defensive programming actually is, and how we can do that in the context of databases in general and SQL Server in specific.