That astronauts in space suits take self-portrait photographs in space is a matter of everyday observation and common public record, requiring no formal academic citation.
The claim is a trivial fact verified by numerous widely published photographs from space missions (such as famous helmet visor selfies taken by astronauts like Buzz Aldrin, and subsequent crew members). Therefore, it falls under common knowledge and does not need academic paper receipts, nor do the provided technical aerospace papers discuss photography specifically.