Here's a good book
JG 26, Photographic History of the Luftwaffe's Top Gun by Donalk L. Caldwell published by Motorbooks International copyright 1994. ISBN 0-87938-845-5
On page 26 there is a black and whit photo that show the tail of the aircraft as kill marking are being painted on, the tips of horizontal stabs and rudder appear to be a different color than the camoflage. Also, on page 98 there is a color side view drawing showing the tips of the wings, horizontal stabs and rudder being yellow. The yellow one is forward of the national marking and a yellow vertical bar is aft. It also shows a yellow penant on the radio mast.
Squadron Signal BF-109 In Action Pt 1 (1044) has this same photo on page 40.
Reddog
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