Books can be attributed to "Unknown" when the author or editor (as applicable) is not known and cannot be discovered. If at all possible, list at least one actual author or editor for a book instead of using "Unknown".
Books whose authorship is purposefully withheld should be attributed instead to Anonymous.
Enjoyed the breadth of the topics covered by the essays in this book. However part of me wonders if the practical tips are being placed before the essential question of what the Christian worldview is at its core. The conservative bent is clear, which is fine, but I have always been suspicious of the dualistic categories that fundamentalism might impose on secular thinking. All the same, that is not the purpose of the authors, who discuss their fields with clarity and relevant examples.