Nickelodeon Magazine Issue November 1999 (Nickelodeon)
SpongeBob SquarePants Production Cel (Nickelodeon, 1999).... | Lot #31217 | Heritage Auctions
Nickelodeon in 1999 | Web Design Museum
1999 - COMMERCIALS from Nickelodeon - PART 2 (Nick Birthday Marathon) - YouTube
Nickelodeon - 1999 Patrick or 2019 Patrick? 💗 #SpongeBob20 | Facebook
Nickelodeon's 20th Birthday
ConsumerofToons on Twitter: "Back in 1999, Nickelodeon didn't really push SpongeBob all that much, and assumed it'd be a sleeper hit. They couldn't have been more wrong! https://t.co/JAlRYb44SQ" / Twitter