Problem with this circuit

I've found this circuit:
gnd------voltage source-----current source------resistor----gnd
all sources are ideal
I shoud calculate the voltage across resistor....how can i do?
A)If i use Kirchhoff voltage law:
voltage source:voltage across current source+voltage across resistor
what is the voltage across current source?
B)If i use Kirchhoff current law:
current source=current across voltage source= Vout/R
is it right?
How can i have the same result with KVL?
Can you help me?
Thanks in advance