Columbia subject headings:
Socialist parties--Yemen (People's Democratic Republic)--Congresses.
Yemen (People's Democratic Republic)--Politics and government--Congresses.
Ḥizb al-Ishtirākī al-Yamanī--Congresses.
Harvard subject headings:
Socialist parties--Yemen, South--Congresses.
Yemen (People's Democratic Republic)--Politics and government--Congresses.
Ḥizb al-Ishtirākī al-Yamanī--Congresses.
Princeton subject headings:
Ḥizb al-Ishtirākī al-Yamanī.