Amazon.com : Wasabi Power Battery for Nikon EN-EL18, EN-EL18a, EN-EL18b, EN-EL18c and Nikon D4, D4S, D5, D6, D850 (with adapters/Grips) : Digital Camera Batteries : Electronics
Amazon.com : STSEETOP Camera LCD Sun Shade Sun Hood Camera LCD Viewfinder Professional Optical Sunshade with Screen Protector for Nikon D4 D4S : Electronics
Amazon.com : Nikon D4 16.2 MP CMOS FX Digital SLR with Full 1080p HD Video (Body Only) (OLD MODEL) : Slr Digital Cameras : Electronics
Amazon.com: Synergy Digital External Microphone, Compatible with Nikon D4 Digital Camera External Microphone 2.4GHz Dual Wireless Lavalier Microphone Set for Cameras : Electronics
David Busch's Nikon D4 Guide to Digital... by Busch, David D.