Bhutan in the IMF and World Bank, and its WTO accession working party
Background
Bhutan became a member of the IMF in 1981, according to its Ministry of Foreign Affairs and External Trade.
It became a member of the World Bank (IBRD and IDA) in 1981. The ministry notes the IBRD Articles of Agreement require countries to join the IMF to become a member of the World Bank Group.
Bhutan became a member of the ADB, UNESCO and the WHO in 1982.
Bhutan is not a WTO member: the WTO lists it among ongoing accessions, and its accession Working Party was established on 6 October 1999.
In plain words
IBRD International Bank for Reconstruction and Development — The World Bank institution whose Articles of Agreement require IMF membership.
Accession Working Party WTO accession working party — The WTO body that examines an applicant's trade regime before it can join.