A Bloody Job Well Done; the Royal Australian Navy And Helicopter Combat Assault Operations in the US Army, Vietnam, 1967 – 1971. Commander Max Speedy, DSC, RANR. Military History and Heritage Victoria Inc.  A well researched and well written account of the RAN Helicopter Flight Vietnam. 

RAN Helicopter Flight Vietnam History  The RAN’s own history page. 

The Machine Gunners of the 135th AHC EMUs  Ray Godfrey