Here are some direct quotes from John Calvin as quoted in different pieces of literature:
“The first man fell because the Lord deemed it meet that he should.” Calvin, Institutes of the Christian Religion, Book III, Ch. 23, Sect. 8
“I freely acknowledge my doctrine to be this: that Adam fell, not only by the permission of God, but by His very secret, the counsil and decree …” Calvin, On the Secret Providence of God, 267
“God not only foresaw the fall of the first man, and in him the ruin of his posterity; but also at his own pleasure arranged it.” Calvin, Institutes of the Christian Religion, Book III, Ch. 23, Sect. 7
“I again ask how it is that the fall of Adam involves so many nations with their infant children in eternal death without remedy unless that it so seemed meet to God? Here the most loquacious tongues must be dumb. The decree, I admit, is, dreadful; and yet it is impossible to deny that God foreknew what the end of man was to be before he made him, and foreknew, because he had so ordained by his decree.” Ibid, Book II, Ch. 23, Sect. 7
“Even the fall of Adam, and through him the fall of the race, was not by chance or accident, but was so ordained in the secret counsels of God." Boettner, The Reformed Doctrine of Predestination, 234