Analysis of information sources in references of the Wikipedia article "קסדת הוקי" in Hebrew language version.
{{cite journal}}: (עזרה){{cite journal}}: (עזרה){{cite web}}: (עזרה){{cite journal}}: (עזרה){{cite journal}}: (עזרה){{cite journal}}: (עזרה){{cite web}}: (עזרה){{cite web}}: (עזרה)The NHL has 60 referees and linesmen under contract and among them are 11 men who do not wear helmets. This is allowed through a grandfather clause in the collective agreement between the NHL Officials' Association and the league, which made wearing helmets mandatory beginning with the 1988-89 season. However, just as the NHL did with its players when helmets became compulsory for them in 1979, a grandfather clause was inserted in the agreement. All referees and linesmen who were employed on or before Sept. 1, 1988 did not have to wear a helmet.
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