I've found 3 different statistics for Pelé assists in world cups. One puts him as the all time top assist provider, another with a shared record, and another with no record at all.
This source, Most assists in FIFA world cup says he has 8 assists.
This source, Historical ranking says he has 6 assists.
This source, 5 World Cup records both Cristiano Ronaldo and Lionel Messi will never break says he has 10 assists.
How many assists does he really have? Is there an official source?