Columbia subject headings:
International trade--History.
Phố Hiến (Vietnam)--Commerce--History.
Phố Hiến (Vietnam)--History.
Harvard subject headings:
International trade--History
Phó̂ Hié̂n (Vietnam)--Commerce--History--Congresses.
Phó̂ Hié̂n (Vietnam)--Commerce--History.
Phó̂ Hié̂n (Vietnam)--History--Congresses.
Phó̂ Hié̂n (Vietnam)--History.
Princeton subject headings:
Phó̂ Hié̂n (Vietnam)--History--Congresses.