For beginners, if you are just going to learn/play (any) simple melody line, imo, you would absorb it better, in the long run, by working it out yourself, by ear, than relying on a "tab".
For developing more advanced, more finessed, versions or arrangements, get out the Beatles Complete Scores, or a transcription of the guitar part (reading notation is almost a requirement) from some other book or one of the guitar magazines, put on Abbey Road and try to work out on your own, and find something which increasingly gets closer and closer to the feel and flow of the tune.
First 4 bars of intro, which is pretty close to the recorded guitar part on the record, albeit an octave higher:
the A7 (4th measure) is slightly different (the inserted A note) than what's played on guitar. Also, the normal rules of d-u-d-u pick patterns are discarded at times when changing strings. However, putting in the (picked) slur notations across strings in text-tab is a real pain, so it's omitted. (example: d-d is a much smoother crossing strings from low to high.)
^ hammer-on or pull-off
less emphasized notes (volume-wise)
Incidentally, as far as published collections of mandolin arrangements of this type of material are concerned.......the major publishers don't want to deal with such a low-demand, low-profit niche product, especially having to deal with the song publishers.
If you're just getting started like me, there is a very basic How to play... video on youtube by a teenaged girl. She shows how to play the song in the first position note by note so I was able to write it out myself.