Table 5.13 – Urinals
Current Guidelines:  
4.22.5  Urinals.  If urinals are provided, then at least one shall comply with 4.18.
Final Revised Guidelines:  
213.3.3  Urinals.  Where more than one urinal is provided, at least one shall comply with 605. 
Model Codes & Standards
IBC 2000:  Section 1108.2 has a similar requirement for the number of urinals.

IBC 2003:  Section 1109.2 has an equivalent requirement for the number of urinals.