fold a twin sheet in half long ways and sew ends together, next sew in five equal sections the size of a pillow case, next insert pillows leaving ends open to remove pillows and wash cover I could make one of these with all the millions of pillows we have!
Google Scholar is awesome. Note: if you get articles that are "pay for" go back to the Rasmussen Library homepage and use Discovery to search for the article title. We might own it in our databases. You won't have to pay.