Reddit, december 25th 2017, 17:00 https://www.reddit.com/r/HistoryPorn/comments/7lvk9w/john_lennon_and_yoko_ono_bought_a_large_billboard/ https://robscholtemuseum.nl/wp-content/uploads/2017/12/John-Lennon-naast-Yoko-Ono-over-Overpopulatie-video-Telegram.mp4 John Lennon, Naast Hem Yoko Ono, Beantwoordt Vraag over Over Populatie (video Telegram)