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variable-interval schedule. Oxford Reference. Retrieved 22 May. 2022, from https://www.oxfordreference.com/view/10.1093/oi/authority.20110803115220925.

"variable-interval schedule." Oxford Reference. . . Date of access 22 May. 2022, <https://www.oxfordreference.com/view/10.1093/oi/authority.20110803115220925>

"variable-interval schedule." Oxford Reference. ; Accessed 22 May. 2022. https://www.oxfordreference.com/view/10.1093/oi/authority.20110803115220925.