Hummels returns as Dortmund look to trim Bayern's lead
Bundesliga Team of the Decade: Lewandowski & Aubameyang form awesome attack | Sporting News Canada
The future of Borussia Dortmund captain Mats Hummels remains a mystery | Sports | German football and major international sports news | DW | 21.04.2016
Mats Hummels: "Borussia Dortmund a bigger team than when I was last here" | Bundesliga
Mats Hummels: Borussia Dortmund's £35 Million Investment Is Paying Dividends
Off the Crossbar: Cologne Alone — Borussia Dortmund's Mats Hummels gone and forgotten - Bavarian Football Works
Roundtable: Should Borussia Dortmund really bring back Mats Hummels?