The distinction between inclusive and exclusive 'we' pronouns is a well-documented linguistic typology found across many language families worldwide, making it common knowledge that does not require a citation.
The claim is a well-known linguistic fact (the inclusive/exclusive distinction in first-person plural pronouns). None of the retrieved papers specifically target or test this exact linguistic universal as their main thesis, though the phenomenon is textbook typology. Since it is a matter of direct linguistic observation and common knowledge, no citations are strictly needed to support it.