Quarterman, John (1985-11-03). "public domain AT&T getopt source". linux.co.cr (originally in mod.std.unix newsgroup). Archived from the original on 2023-05-12. Retrieved 2024-04-22.
"getopt" (The Open Group Base Specifications Issue 7, 2018 edition; IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)ed.). The Open Group. 2018. Archived from the original on 2024-03-24. Retrieved 2024-04-22.
"getsubopt" (The Open Group Base Specifications Issue 7, 2018 edition; IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)ed.). The Open Group. 2018. Archived from the original on 2023-12-02. Retrieved 2024-04-22.
Quarterman, John (1985-11-03). "public domain AT&T getopt source". linux.co.cr (originally in mod.std.unix newsgroup). Archived from the original on 2023-05-12. Retrieved 2024-04-22.
"getopt" (The Open Group Base Specifications Issue 7, 2018 edition; IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)ed.). The Open Group. 2018. Archived from the original on 2024-03-24. Retrieved 2024-04-22.
"getsubopt" (The Open Group Base Specifications Issue 7, 2018 edition; IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)ed.). The Open Group. 2018. Archived from the original on 2023-12-02. Retrieved 2024-04-22.