2. 梅川廖氏族譜 廖紹洙. Meichuan Liao shi zu pu / Liao Shaozhu. [China?] : [publisher not identified], Li zong bao you 4 [1256][China? : s.n.], 理宗寶祐4 [1256] Book Microform Physical ReCAP ECF8226-8242
3. Coin: 18554 Theodore II (1254 to 1258), billon trachy, Magnesia Coin Physical Special Collections Coin 18554 Available
4. Coin: 12282 Mitso Asen, billon trachy, Veliki Preslav Coin Physical Special Collections Coin 12282 Available
5. Coin: 12284 Mitso Asen, billon trachy, Veliki Preslav Coin Physical Special Collections Coin 12284 Available