"Sir, I have the honour to acknowledge the receipt of your letter dated April 21st, 1937......", April [29th], 1937.. 特藏中心.

"Sir, I have the honour to acknowledge the receipt of your letter dated April 21st, 1937......", April [29th], 1937.. 特藏中心. http://10.55.102.87:8081/repositories/2/archival_objects/38805 Accessed June 28, 2025.

(顾维钧, 1888－1985)

(顾维钧, 1888－1985, n.d.)

(顾维钧, 1888－1985, n.d.)

顾维钧, 1888－1985, “‘Sir, I Have the Honour to Acknowledge the Receipt of Your Letter Dated April 21st, 1937......", April [29th], 1937.,” ., accessed June 28, 2025, http://10.55.102.87:8081/repositories/2/archival_objects/38805.

顾维钧, 1888－1985. "Sir, I Have the Honour to Acknowledge the Receipt of Your Letter Dated April 21st, 1937......", April [29th], 1937.[Z/OL]([no date])[2025–06–28]. http://10.55.102.87:8081/repositories/2/archival_objects/38805.