How to abbreviate External Respiration?

The ways to abbreviate External Respiration.

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ER:
External Respiration
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APASmart Define. (2017). external respiration. Retrieved September 21, 2026, from http://smartdefine.org/external_respiration/abbreviations/a
ChicagoSmart Define. 2017. "external respiration" http://smartdefine.org/external_respiration/abbreviations/a (accessed September 21, 2026).
HarvardSmart Define 2017, external respiration, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/external_respiration/abbreviations/a>.
MLASmart Define. "external respiration" 18 December 2017. Web. 21 September 2026. <http://smartdefine.org/external_respiration/abbreviations/a>