This subject guide provides information about the 6th edition of the APA Publication Manual. Information about the 7th edition of the APA Publication Manual may be found on a separate subject guide, linked below.
The book does not really address citing mobile apps like Nursing Central. There is information on the APA style blog here, "How to Cite a Mobile App".
You can use this information to get started, for example, you should be able to find a Version number in most apps. In Nursing Central, you click on the menu in the upper left and scroll down to find the version (1.31) at the bottom of the page. However since Nursing Central contains several different distinct resources, you really need to provide more information so that someone reading your paper can find the actual part you used.
When you click on one of the resources, for example, Davis’s Drug Guide, you should see a link labeled About… which provides information about that specific resource. Since Davis’s Drug Guide is actually an ebook, About.. will tell you the authors, the edition, and the copyright date. You can use this information just as you would to cite a regular ebook but you also have to show that it came from Nursing Central.
These two examples show how you might do that for Davis’s Drug Guide and for Disorders and Conditions used within Nursing Central.
Sommers, M. S. & Fannin, E. F. (2015). Pancreatitis. In Diseases and disorders: A nursing therapeutics manual (5th ed.). In Nursing Central for Apple iOS (Version 1.31) [Mobile application software]. Retrieved from https://nursing.unboundmedicine.com/nursingcentral
Vallerand, A. H., Sanoski, C. A., & Deglin, J. H. (2017). Acai berry. In Davis’s drug guide for nurses (15th ed.) In Nursing Central for Apple iOS (Version 1.31) [Mobile application software]. Retrieved from https://nursing.unboundmedicine.com/nursingcentral