The J. R. R. Tolkien Companion and Guide
The J . R . R . Tolkien Companion and Guide ( 2006 ) by Wayne G . Hammond and Christina Scull , following their 2005 "The Lord of the Rings: A Reader's Companion" is a two-volume work of reference on J . R . R . Tolkien and Tolkien studies . 
<triplet> The J. R. R. Tolkien Companion and Guide <subj> Christina Scull <obj> author <subj> J. R. R. Tolkien <obj> main subject <triplet> Christina Scull <subj> Wayne G. Hammond <obj> spouse