Figure 2.  Citation patterns in The Dinosauria (second edition).  Blue bars show the autocitation index (ACI), expressed as the percent of cited references in the text of each chapter that were written by that chapter’s author(s).  Red bars show the allocitation index (aCI), the percent of all other references in all other chapters written by those same authors.  (Note that the aCI for authors increases by 1 per reference, but only by 0.5 if that reference includes authors of the citing chapter as well.)  The yellow area highlights the non-systematic section of the book.  Chapters are labeled as in Figure 1.  The aCI = 0 for Chapter 24 (dinosaur distributions); citations in this chapter are confined to tables and not tallied here.