How do I do multiple full outer joins to the 4 tables? I got it for one table.

SELECT H.CUSIP, H.ACCOUNT, NVL(sourcedoc.doc_recv,'Not Defined') AS source_doc;
FROM holdrecn H FULL OUTER JOIN sourcedoc;
on h.source_num=sourcedoc.source_num;
where &itemtype

but I need it for 3 more tables

NVL(PD.reas_desc,'Not Defined') AS Ovr30_reas,;
NVL(R.OOB_desc,'Not Defined') AS oob_reason,;
NVL(A.OOB_desc,'Not Defined') AS act_taken