http://www.discogs.com/Pet-Shop-Boys-Yesterday-When-I-Was-Mad-The-Mixes/release/220557.
https://www.discogs.com/it/Pet-Shop-Boys-Yesterday-When-I-Was-Mad/release/208573.
https://www.discogs.com/it/Pet-Shop-Boys-Yesterday-When-I-Was-Mad/release/208573.