Columbia subject headings:
Harvard subject headings:
China--History--Tang dynasty, 618-907.
China--Politics and government--581-907
Political ethics--China.
Tang Taizong, Emperor of China, 597-649
Princeton subject headings:
China--History--Tang dynasty, 618-907.
China--Politics and government--581-907.
Political ethics--China.
Tang Taizong, Emperor of China, 597-649.