1) visit www.publicdomainpictures.net
2) Key in the picture keywords in Google, go advanced search, click free to use or share under the usage rights
3) visit https://www.flickr.com/
Choose Creative Commons
Welcome to my Academic Blog
1) visit www.publicdomainpictures.net
2) Key in the picture keywords in Google, go advanced search, click free to use or share under the usage rights
3) visit https://www.flickr.com/
Choose Creative Commons