657—6.3 (155A) Reference library. References may be printed or computer-accessed. A reference library shall be maintained which includes, as a minimum, one current reference from each of the following categories, including access to current periodic updates.
	      1. 	  The Iowa Pharmacy Law and Information Manual.
	      2. 	  A patient information reference that includes or provides patient information in compliance with rule 657—6.14(155A).
	      3. 	  A reference on drug interactions.
	      4. 	  A general information reference.
	      5. 	  A drug equivalency reference.
	      6. 	  A reference on natural or herbal medicines.
	      7. 	  The readily accessible telephone number of a poison control center that serves the area.
	      8. 	  Additional references as may be necessary for the pharmacist to adequately meet the needs of the patients served.