Nan, L.; Liu, Y.; Lü, M.; Yang, K. (2008). "Journal of Materials Science: Materials in Medicine, Volume 19, Number 9". Journal of Materials Science: Materials in Medicine. 19 (9). SpringerLink: 3057–62. doi:10.1007/s10856-008-3444-z. PMID18392666. S2CID42699587.
Nan, L.; Liu, Y.; Lü, M.; Yang, K. (2008). "Journal of Materials Science: Materials in Medicine, Volume 19, Number 9". Journal of Materials Science: Materials in Medicine. 19 (9). SpringerLink: 3057–62. doi:10.1007/s10856-008-3444-z. PMID18392666. S2CID42699587.
Nan, L.; Liu, Y.; Lü, M.; Yang, K. (2008). "Journal of Materials Science: Materials in Medicine, Volume 19, Number 9". Journal of Materials Science: Materials in Medicine. 19 (9). SpringerLink: 3057–62. doi:10.1007/s10856-008-3444-z. PMID18392666. S2CID42699587.
summerthought.com
A book on Canadian history describes how "The term 'latch string out' held great meaning to any pioneer woman. If a cabin door’s interior latch had a string on the outside, anyone could open it." See Eleonor G. Luxton, Latch String Out, Summerthought Publishing, Banff, 2015.