There are two options that you will see in PsycBooks - PDF full text allows you to click and read the book or book chapter right away in full text.
The WorldCat search means the book is not in full text in this database. Sometimes, if you scroll down after clicking on the title, you can access PDFs of the book chapters. If that does not work, you can click on the WorldCat button and search libraries around the world for a copy.
You can then search the Webster University Library catalog by clicking on the link that looks like the one below.
The PsycBooks database includes mostly scholarly titles published by American Psychological Association from copyright years 1953 - present. It also includes classic books of historical importance in the field.