Angular momentum is a pseudovector (or axial vector) by definition because it is defined as the cross product of position and momentum vectors, which imparts specific transformation properties under spatial inversions and rotations; no citation is needed for this standard textbook definition.
The claim defines a fundamental mathematical and physical property of angular momentum: that it behaves as a pseudovector (axial vector) because it is constructed from a cross product. This is a basic definition taught in introductory physics and vector calculus, making it common knowledge. None of the retrieved papers specifically address or contest the definition of pseudovectors in relation to angular momentum in a research context.