A Commentary, Critical, Practical, and Explanatory on the Old and New Testaments, by Robert Jamieson, A.R. Fausset and David Brown  at sacred-texts.com
2 Chronicles 18:2
ch2 18:2JEHOSHAPHAT AND AHAB GO AGAINST RAMOTH-GILEAD. (2Ch. 18:1-34)
after certain years he went down to Ahab to Samaria--This is word for word, the same as 1Ki. 22:1-53. (See commentary on that chapter).