《魏书·列传·卷九》
而于忠身任武职，统领随意，阻隔内外，使朝见拜谒简略断绝。
而于忠身居武司，禁勒自在，限以内外，朝谒简绝。
Yu Zhong holds a military title, takes command at will, obstructs the inside and outside, and causes abbreviated and severed greetings at court.