By 1888, three versions of Coca-Cola – sold by three separate businesses – were on the market. A copartnership had been formed on January 14, 1888 between Pemberton and four Atlanta businessmen: J.C. Mayfield, A.O. Murphey; C.O. Mullahy and E.H. Bloodworth. Not codified by any signed document, a verbal statement given by Asa Candler years later asserted under testimony that he had acquired a stake in Pemberton's company as early as 1887.[16] John Pemberton declared that the name "Coca-Cola" belonged to his son, Charley, but the other two manufacturers could continue to use the formula.[17]Charley Pemberton's record of control over the "Coca-Cola" name was the underlying factor that allowed for him to participate as a major shareholder in the March 1888 Coca-Cola Company incorporation filing made in his father's place.[18] Charley's exclusive control over the "Coca Cola" name became a continual thorn in Asa Candler's side. Candler's oldest son, Charles Howard Candler, authored a book in 1950 published by Emory University. In this definitive biography about his father, Candler specifically states: "..., on April 14, 1888, the young druggist [Asa Griggs Candler] purchased a one-third interest in the formula of an almost completely unknown proprietary elixir known as Coca-Cola."[19]