Thank you Dave Venables and Mitchell for your respective replies to my email. Legman's bibliography is very interesting and useful. I appreciate the suggestion very much.
The following quote is by David Lister. You can find it here: https://www.britishorigami.org/cp-lister-list/lillian-oppenheimer The word "origami" was also mentioned as the Japanese word for paperfolding in Robert Harbin's book, "Paper Magic" in 1956 (...) At the same time, the word "Origami" appeared in the titles of several books in English by Japanese authors that were just beginning to appear in the United States and Europe. Which might be those "books in English by Japanese authors"? I checked for Japanese family name's in the bibliography, but none of the book titles seemed to be in English. If you can help me, you can reply through the list or privately if you prefer: gerardo(a)neorigami.com Thank you once again! -- Gerardo G. gerardo(a)neorigami.com instagram.com/NeorigamiComKnowledge and Curiosity in Origami: six private classes online "(...) It doesn’t happen often, but when it does, it takes your breath away and fills you with the true joy of origami. I experienced this in my lessons with Gerardo G. I wouldn’t trade it for anything. Gerardo is (...)" C. R. Read the full review
