Reference book https://elementary.oslis.org/learn-to-research/plan/plan-my-sources/images-for-plan-my-sources-table/reference-book/view https://elementary.oslis.org/learn-to-research/plan/plan-my-sources/images-for-plan-my-sources-table/reference-book/@@download/image/Grzimek's.jpg Reference book Click to view full-size image… Size: 8.8 KB