Caswell, Lyman R.; Savannunt, Diana S. (January 1988). "Temperature and solvent effects on the experimental dipole moments of three crown ethers". Journal of Heterocyclic Chemistry25 (1): 73–79. doi:10.1002/jhet.5570250111.
Cook, Fred L.; Caruso, Thomas C.; Byrne, Michael P.; Bowers, Chauncey W.; Speck, Don H.; Liotta, Charles L. (1974). "Facile syntheses of 12-crown-4 and 15-crown-5" (in en). Tetrahedron Letters15 (46): 4029–4032. doi:10.1016/S0040-4039(01)92075-1.
Caswell, Lyman R.; Savannunt, Diana S. (January 1988). "Temperature and solvent effects on the experimental dipole moments of three crown ethers". Journal of Heterocyclic Chemistry25 (1): 73–79. doi:10.1002/jhet.5570250111.