The VHO is the principal source of information about health activities scheduled to take place in the village and about requirements for obtaining vaccinations, such as the acquisition of a vaccination booklet during an ANC.
Stone has said Credico was his principal source of information about WikiLeaks, an allegation Credico denies.
Their works are the principal source for information about Christianity during the two or three generations following the Apostles.
There seems to be a generation of people for whom the Internet is the principal source of information about the world.
The principal source of information about his life is a biography in the Shiji ("Records of the Historian") by Sima Qian.
He would not succeed in stopping publication of the book version, "Picasso et Ses Amis" (1933), and these memoirs remain a principal source of information about the Bateau Lavoir circle and Picasso's early days in Paris.
According to Julius Caesar, who is the principal source of information about the Druids, there were two groups of men in Gaul that were held in honour, the Druids and the noblemen (equites).
His Rymes of Robyn Hood (1977, with John Taylor) printed the original texts of the ballads and plays which are our principal source of information about the popular hero; and in The Peasants' Revolt of 1381 19711) he collected and translated documents previously available only in their original Latin and French.
When he later spoke to Marjorie Wallace, the author of a 1986 book, "The Silent Twins," which is out of print in the United States but remains the principal source of information about the girls, he described a parade of white arms and then, suddenly, a black one.
The principal source of information about Velázquez's early career is the treatise Arte de la pintura ("The Art of Painting"), published in 1649 by his master and father-in-law Francisco Pacheco, who is more important as a biographer and theoretician than as a painter.
