All these letter folds are published in ELFA booklets 1st and 2nd Edition by John Cunliffe. John gave permission to do so. Only, the creators of the envelopes are mentioned in the back of the original publication, and not with the diagrams themselves. Gerard Hughes doesn't mention the creators of the envelopes. Here you can find a list of the creators of the models on this website in order of the index on http://www.ghh.com/elf/index.html