Look at this reference. What kind of material is being referenced below?

Tizian, A.(2013). Havard's nursing guide to drugs (9th ed.). Chatswood , Australia:
Elsevier Australia.

The material being referenced is a book called "Havard's nursing guide to drugs" by A. Tizian, which is in its 9th edition. It was published by Elsevier Australia in Chatswood, Australia in 2013.

The reference you provided is for a book titled "Havard's Nursing Guide to Drugs" (9th edition) by author A. Tizian. The material being referenced is a book.