I tried to index all the Malvina Reynolds songs we have in this thread (click). The lyrics Masato linked to are identical to what I find in the Oak Publications songbook called Little Boxes and Other Handmade Songs by Malvina Reynolds.

And just for clarification - the song is not by the Seekers, and it's not by PP&M, and it's not a Sesame Street Song. It was written by Malvina Reynolds, and published in 1957, when PP&M and the Seekers were in diapers and Sesame Street wasn't even on radio.

Harvesting marks (^^) show the song has been harvested for the Digital Tradition.
-Joe Offer-