Credo contains all types of reference books:
Credo ebooks can be read instantly within any Internet browser. You can also download Credo book chapters as pdf files, so you can access them on any device with a pdf reader. (Learn more.)
ACLS ebooks can be read instantly within any Internet browser. You can also download ACLS book chapters as PDF files, so you can access them on any device with a PDF reader.
Browse by title, author, or subject. Search gives many limiter options, including the ability to search within full text. Click on a book's title to proceed.
Visit the site's FAQ to determine how to access and download their collection.