"The poems come from one of the earliest surviving texts of Tamil poetry, the Kuruntokai, an anthology of love lyrics probably recorded during the first three centuries A.D. An essay on Tamil poetry explains its techniques and enriches the reader's pleasure in these quiet, controlled, yet dramatic poems."
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.