Ahl published in <citetitle>101 BASIC Computer Games</citetitle>,
July 1973. This was a port of Mayfield's version obtained from the HP
Contributed Programs library. </para>
Ahl published in <citetitle>101 BASIC Computer Games</citetitle>,
July 1973. This was a port of Mayfield's version obtained from the HP
Contributed Programs library. </para>