When writing nonfiction articles or books, you can add depth and authenticity to your material by quoting from authorities on your topic. This is particularly helpful if you do not have impressive credentials yourself. In some cases you may find the quotes you need in their writings, but other times you will need to seek out the authorities and ask specific questions to get the quotes you need. You may need to get permission to use the quotes from their writings, and they may charge you for them, but you don't need to pay them for the original quotes. They get their name and words in print as payment.