I am currently writing a biography of a band, and have a question regarding citing quotes, such as from interviews. Is it necessary to cite everything a person (for example a band member or manager) has said, from the original source of the speech?
The reason I ask is because an already published biography on a similar subject has quotes from people that are originally from interviews that were, for example, originally from the NME or newspaper interviews that I have located on the internet. The book has no acknowledgement (footnotes, bibliography) that these quotes are from other interviews/pieces. Is this because the author will have cleared the rights to use it with the original publisher, or are there different rules when citing speech?
Thank you very much for your time!