Todos los 2 John Elfers lanzamientos en Paperback Bo... Book
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![Cover for John Elfers · The Spectrum of Gratitude Experience (Paperback Book) [Softcover reprint of the original 1st ed. 2016 edition] (2018)](https://imusic.b-cdn.net/images/item/original/464/9783319822464.jpg?john-elfers-2018-the-spectrum-of-gratitude-experience-paperback-book&class=scaled&v=1609388669)
![Cover for John Elfers · The Spectrum of Gratitude Experience (Hardcover Book) [1st ed. 2016 edition] (2016)](https://imusic.b-cdn.net/images/item/original/296/9783319410296.jpg?john-elfers-2016-the-spectrum-of-gratitude-experience-hardcover-book&class=scaled&v=1482924956)