how do you use include here

[tedbooks]

i have a pricelist that displays products in a list and i have made a secondry file called options.php in the module directory which puts the options in a table

in the price list i have

       case 'PL_SHOW_NOTES_A':
               $prodRow .= '<td class="ntsaPL">require(DIR_WS_MODULES . 'options.php')</td>' . "\n";
               break;

but i don't think it is correct