- From The Hindu Archives, July 21, 1976: Viking craft lands on Mars, sends back clear pictures The Hindu
- Monday briefing: 50 years after Viking landed on Mars, did Nasa overlook evidence of life? The Guardian
- From Viking 1 to Mangalyaan, how Mars exploration has evolved over 50 years ThePrint
- From Hampton to Mars: How NASA Langley Helped Land on the Red Planet NASA (.gov)
- Did Viking 1 find life on Mars 50 years ago? Here’s why the debate continues Space