The logbooks we use in New Zealand have a page at the front specifically for aircraft type ratings..there is also a separate form that the instructor signs and sends off to the NZCAA.
This is the form we use.
www.caa.govt.nz/forms/24061-13.pdf
For overseas authorities we can request a letter from the NZ CAA which also details the aircraft type ratings.
We also made a sticker that you can put into your logbook..Something along the lines of " This is to certify that ...[name]... has successfully demonstrated technical knowledge of a ..[aircraft].. and the ability to perform competently all normal, abnormal and emergency maneuvers appropriate to the aircraft type in accordance to the requirement of CAR Part 61"
This way you can carry a nice official looking sticker in your logbook and a signed competency sheet.