text: The following references are for critical reviews of published stability constants for various classes of ligands. All these reviews are published by IUPAC and the full text is available, free of charge, in pdf format.
  *ethylenediamine (en) 
  *Nitrilotriacetic acid (NTA)
  *aminopolycarboxylic acids (complexones)
  *Alpha hydroxy acids and other hydroxycarboxylic acids
  *crown ethers
  *phosphonic acids
  *imidazoles and histamines
  *amino acids with polar side-chains
  *nucleotides
  *acetylacetone
  *general
  *Chemical speciation of environmentally significant heavy metals with inorganic ligands. Part 1: The Hg–Cl, OH, , , and  systems.
  *Chemical speciation of environmentally significant metals with inorganic ligands Part 2: The Cu–OH, Cl</sup>, , , and  aqueous systems
  *Chemical speciation of environmentally significant metals with inorganic ligands Part 3: The Pb–OH, Cl</sup>, , , and  systems
  *Chemical speciation of environmentally significant metals with inorganic ligands. Part 4: The Cd–OH, Cl, , , and  systems