If you can't find Panzer Tracts #4 (there are plans to release a multi-volume set as was done with the Panther) you could get the German or English language book.
German book which can be found on Amazon.de
English one you can buy from RZM but note the plans are not to 1/35th scale. There are other issues as well with the plans.
It should be noted that History Facts plan to release a series on the Pz IV as well:
The first English language book is expected in the first quarter of 2013.
I hope this helps,
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