The name of lectures of integral calculus written by Johann or Jeans Bernoulli (he is called by both names as far as I know) might be " lecciones mathematicæ de calculo integral". I searched for one day for the english translation, I couldn't even find the english title of his book on integral calculus. I found his books called Operae, in latin, which contains these lectures, but onceagain, I couldn't even find a single english edition. I am really in need of his book, as he was the first to study lebnizian calculus; ofcourse Jackob Bernoulli also studied with Johann Bernoulli; anyway please help me in finding Bernoulli's books on integral calculus, either in google books or anywhere. Atlast if nothing can be found, please say the title of english edition of his calculus lectures and the name of the translator of it. I already have L'Hopital book on differential calculus (claimed to be the first textbook on differential calculus) which contains Johann Bernoulli's lectures on differential calculus, but it doesn't contain lectures on integral calculus. If possible can anyone also point out some of the oldest books on integral calculus.