The story of the steps leading up to China's declaration of war is admirably told in Reid, op. cit. pp. 88-109.
Port of the letter is quoted by Dr. Reid, p. 108.
Reid, op. cit. p. 161. Chap. vii. of this book, "Commercial Rivalries as affecting China," should be read by anyone who still thinks that the Allies stood for honesty or mercy or anything except money-grubbing.
Appendix C, pp. 421-4.
A list of these loans is given by Hollington K. Tong in an article on "China's Finances in 1918" in China in 1918, published early in 1919 by the Peking leader, pp. 61-2. The list and some of the comments appear also in Putnam Weale's The Truth about China and Japan.