"Caves of oblivion": opium dens and exclusion laws, 1850-1882
Diana Lynn Ahmad
(Berkeley: University of California Press, 1975): 147; Jonathan D. Spence, The Search for Modern China (New York: W. W. Norton & Company, 1990), 87-89, 131; Geoffrey C. Ward with Frederic Delano Grant, Jr., "'A Fair, Honorable, and ...