NMDA receptor mediated plasticity figure reference
One of the "Boss references" (nearly 11000 citations right now) for this is Bliss and Collingridge, A Synaptic Model of Memory: Long-Term Potentiation in the Hippocampus.
Being from 1993, it has references to some of the earlier work in this field (if that's what you're looking for). 
It notes the different forms of NMDA-dependent and independent plasticity.
Another paper, also from 1993, on this topic is Malenka and Nicoll, NMDA-receptor-dependent synaptic plasticity: multiple forms and mechanisms

Some nice reviews with more recent work, focusing on the NMDAR itself include:


Paoletti et al, NMDA  Receptor Subunit Diversity:
Impact on Receptor Properties,
Synaptic Plasticity and Disease
Lau &amp; Zukin, NMDA Receptor Trafficking in Synaptic Plasticity and Neuropsychiatric Disorders


and their references.