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Bibliographic details for Undefined values/Check if a variable is defined

Page name: Undefined values/Check if a variable is defined
Author: Rosetta Code contributors
Publisher: Rosetta Code.
Date of last revision: 10 November 2011 20:30 UTC
Date retrieved: 24 March 2025 03:51 UTC
Permanent URL: https://rosettacode.org/wiki/Undefined_values/Check_if_a_variable_is_defined?oldid=206655
Page Version ID: 206655

Citation styles for Undefined values/Check if a variable is defined

APA style

Undefined values/Check if a variable is defined. (2011, November 10). Rosetta Code. Retrieved 03:51, March 24, 2025 from https://rosettacode.org/wiki/Undefined_values/Check_if_a_variable_is_defined?oldid=206655.

MLA style

"Undefined values/Check if a variable is defined." Rosetta Code. 10 Nov 2011, 20:30 UTC. 24 Mar 2025, 03:51 <https://rosettacode.org/wiki/Undefined_values/Check_if_a_variable_is_defined?oldid=206655>.

MHRA style

Rosetta Code contributors, 'Undefined values/Check if a variable is defined', Rosetta Code, 10 November 2011, 20:30 UTC, <https://rosettacode.org/wiki/Undefined_values/Check_if_a_variable_is_defined?oldid=206655> [accessed 24 March 2025]

Chicago style

Rosetta Code contributors, "Undefined values/Check if a variable is defined," Rosetta Code, https://rosettacode.org/wiki/Undefined_values/Check_if_a_variable_is_defined?oldid=206655 (accessed March 24, 2025).

CBE/CSE style

Rosetta Code contributors. Undefined values/Check if a variable is defined [Internet]. Rosetta Code; 2011 Nov 10, 20:30 UTC [cited 2025 Mar 24]. Available from: https://rosettacode.org/wiki/Undefined_values/Check_if_a_variable_is_defined?oldid=206655.

Bluebook style

Undefined values/Check if a variable is defined, https://rosettacode.org/wiki/Undefined_values/Check_if_a_variable_is_defined?oldid=206655 (last visited March 24, 2025).

BibTeX entry

 @misc{ wiki:xxx,
   author = "Rosetta Code",
   title = "Undefined values/Check if a variable is defined --- Rosetta Code{,} ",
   year = "2011",
   url = "https://rosettacode.org/wiki/Undefined_values/Check_if_a_variable_is_defined?oldid=206655",
   note = "[Online; accessed 24-March-2025]"
 }

When using the LaTeX package url (\usepackage{url} somewhere in the preamble) which tends to give much more nicely formatted web addresses, the following may be preferred:

 @misc{ wiki:xxx,
   author = "Rosetta Code",
   title = "Undefined values/Check if a variable is defined --- Rosetta Code{,} ",
   year = "2011",
   url = "\url{https://rosettacode.org/wiki/Undefined_values/Check_if_a_variable_is_defined?oldid=206655}",
   note = "[Online; accessed 24-March-2025]"
 }