found: Fox, F.L. A distant storm : the Four Days' Battle of 1666, 1996.
found: Brassey's battles, 1995(Dover Strait, or the Four Days' Battle)
found: Dupuy, T.N. Collins encyclopedia of military history, 4th ed.:p. 610 (The Four Days' Battle commenced off North Foreland with an English attack (June 1); the arrival of Dutch reinforcements caused Monck to begin withdrawal (June 2). Rupert's squadron after being delayed by adverse winds returned (June 3, evening). Following a fierce engagement, in which 20 English ships were lost, Monck and Rupert retreated to the Thames (June 4))
found: Eggenberger, D. Dict. of battles, 1967(Dover Strait)
found: Sanderson, M. Sea battles, 1975(Four Days' Battle)
