Expert Card Technique: Close-Up Table Magic by Jean Hugard and Frederick Braue Page 302 et seq.
Personal Comment: Such a lovely little trick. The effect is clear and the method easy. Here is one thing I would add. I would not drop the deck face down but face up. That way the face up selection under the magazine makes not only more sense, but also, since the deck would be turned face up after the magazine is on the floor, strenghten the method.