OER falls under the 5-r's of open content: Retain, Reuse, Revise, Remix and Redistribute.
OER gets published, just like your textbook, and there are many companies who publish OER textbooks and tools.
Check out this Publishing OER LibGuide by the librarians at Albert S. Cook Library at Towson University.
On this same page you will find a number of great planning tools as well.
Think of these as the citation style for OER, similar to the MLA, APA or Chicago style you may already be using - but easier!
Examples of attribution statements:
Attributing a text that has been borrowed and modified with edits and additional content, from Chapter 11 of BC Campus's Adaptation Guide :
This chapter is an adaptation of Physical Geography and Natural Disasters by R. Adam Dastrup and is used under a CC BY-NC-SA 4.0 license. Changes include rewriting some of the passages and adding original material.
Attributing a text that has been adopted without changes, from Chapter 11 of BC Campus's Adaptation Guide:
This chapter is composed of text taken from Chapter 2.2 of Physical Geography and Natural Disasters by R. Adam Dastrup and is used under a CC BY-NC-SA 4.0 license. No changes have been made nor original material added.
Attributing a photo that has been altered, from from Chapter 11 of BC Campus's Adaptation Guide:
Dog by David Locke is used under a CC BY 2.0 license. Modifications to this photo include cropping.
Attributing an unaltered photo using a caption, from Chapter 9 of a textbook by PCC authors titled Understanding New Media Arts:
Mark Rothko, No 1. (Royal Red and Blue), 1954, oil on canvas, 288.9 cm × 171.5 cm (113¾ in × 67½ in), Private collection. Source: Wikipedia, License: Fair use.
OER - Open Educational Resources: Licenses & Attribution by PCC Library under a Creative Commonts Attribution 4.0 International