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 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.