Zotero is a free and open source software that enables you to organize your research, create bibliographies and insert citations in your research papers. Easy to use, it connects with your web browser to download sources. Zotero allows you to attach PDFs and notes to your citations, organize them into collections for different projects.
Among the many existing citations styles, the CNSMDL opted to apply the APA citation style for citations and bibliographic references. Two very useful links below :
You may be surprised to learn that just because you have found something on the Internet or in a book you are not allowed to use it in a paper. Whether the image is copyright-free or not ( copyright permission is mandatory before using it), you are always under the obligation to acknowledge its source.