Culture Re-View: The history behind the 420 tradition
What is 420? The meaning and origins behind 'Weed Day', The Independent
What is 420? Quantum 9 Answers the Question about the Holiday
Marijuana legalization unlikely to blame for Denver crime increase – The Denver Post
What Does 420 Friendly Mean: A Breakdown
What Does 420 Mean? The Stoner Holiday Explained by its Creators
The History of 420. To celebrate the 50th anniversary of…, by SLANG Worldwide
Where Did 420 Come From, And Where Is It Going? - Sensi Seeds
Here Are All the States That Have Legalized Weed in the US – NBC Los Angeles
What does 4/20 mean and why is it celebrated?
Part party, part call to action: A look at pot holiday 4/20
420 History: How April 20 Became Known as 'Weed Day
How a Group of High Schoolers Coined the Term 420 in Northern California in the 1970's - Active NorCal
Culture Re-View: The history behind the 420 tradition