  Quarkonia represent excellent tools for understanding the role of multiparton
interactions (MPI) in small systems, i.e., pp and p-A collisions. Probing MPI
with quarkonia can be done directly by looking at quarkonium associated
production, or indirectly by studying the multiplicity dependence of quarkonium
production. In these proceedings, the results from the ALICE experiment on
direct and indirect MPI probes are discussed. The self-normalized yields of
charmonium production as a function of the charged-particle multiplicity in pp
and p--Pb collisions at \sqrt{s} = 13 TeV and \sqrt{s_{NN} = 8.16 TeV,
respectively, are discussed. Additionally, the corresponding measurements of
the charmonium self-normalized excited-to-ground state ratio as a function of
the charged-particle multiplicity are reported. The new measurement of the
double J/\psi production at forward rapidity in pp collisions at \sqrt{s} = 13
TeV TeV is presented. Finally, the multiplicity dependence of the bottomonium
production in pp collisions at \sqrt{s} = 13 TeV is discussed. The comparison
to the available theoretical calculations is reported.
