Baha'u'llah provided for the institution in his own writings, which is the basis Baha'is give for its authority.
Source A Concise Encyclopedia of the Baha'i FaithPeter Smith
This source names The Universal House of Justice directly: "A 48-minute film commissioned by the Universal House of Justice for the bicentenary of the birth of the Bab, founder of the Babi Faith."
Source The Baha'i World Centre's Own Page for Dawn of the Light (2019)
Source A Concise Encyclopedia of the Baha'i FaithPeter Smith
This source names The Universal House of Justice directly: "ministry and the eventual election of the Universal House of Justice."
Source The Life and Work of Shoghi Effendi (Baha'i Reference Library)
This source names The Universal House of Justice directly: "small chamber at the northwest corner. The Universal House of Justice administers a structured nine-day pilgrimage there for registered Baha'is, though the grounds welcome visitors of every faith."
Source Shrine of Baha'u'llah, Wikipedia
This source names The Universal House of Justice directly: "and the structured nine-day pilgrimage the Universal House of Justice administers there."
Source Shrine of Baha'u'llah, Wikipedia
The Universal House of Justice is seated at the World Centre; the institution and the place are distinct and the atlas keeps them apart.
Source A Concise Encyclopedia of the Baha'i FaithPeter Smith
This source names The Universal House of Justice directly: "the Light," the film commissioned by the Universal House of Justice for the 200th anniversary of the birth of the Bab."
Source The Baha'i World Centre's Own Page for Dawn of the Light (2019)
This source names The Universal House of Justice directly: "published under the supervision of the Universal House of Justice at the Baha'i World Centre in Haifa."
Source The Baha'i World, Volume XVI (1973-1976): The History of New Era High SchoolThe Baha'i World Centre, under the supervision of the Universal House of Justice
This source names The Universal House of Justice directly: "Galilee in 2008, also recorded here, the Universal House of Justice marked the completion of the nineteen terraced gardens climbing Mount Carmel around the Shrine of the Bab with a ceremony at the..."
Source Statement of the Universal House of Justice for the Opening of the Terraces on Mount Carmel (Baha'i World News Service)
This source names The Universal House of Justice directly: "Master's House in Haifa and elected the Universal House of Justice, the nine member body Baha'u'llah's writings designated as the faith's supreme legislative and administrative institution, seating..."
Source Origins of the Universal House of Justice (Baha'i Reference Library)