I have never read Vance Dickason's book. However, both of David Weems' books give you a chart, made up by AN Thiele himself and modified by Small, of useful "Qts/box size combos" for each Qts in vented systems. The original chart is also available from Thiele's article on vented loudspeakers in the Journal of the Audio Engineering Society, Loudspeakers in Vented Boxes, Part I. This is available online from the Journal of the Audio Engineering Society for something like 5 bucks.

It should be noted that Small found that Thiele's alignments work well in the real world if you simply increase Vb 35% over that which Thiele's chart states. Don't modify anything else, just increase the real-world volume 35% over the stated formula. Small and Weems modified their charts accordingly, so that the Vb they state is the real-world volume you need.

Weems also tells you how to modify tuning, etc. to get good results when you are using a driver/box combination that is NOT ideal according to the chart. In point of fact, you have wide variation that is possible.

To briefly summarize, the "classic" bass reflex consists of a driver with a Qts of .38, (or .4), the Vb, (box volume) is equal to Vas, and the Fb, (frequency of the box tuning) is equal to Fs. This will yield a box where the F3 is equal to Fs as well.

If your Qts is BELOW .38, then your ideal box volume will be smaller than Vas, and your Fb and F3 will be ABOVE Fs.

If your driver's Qts is .3, for example, then your ideal box volume is .5 Vas, your Fb will be 1.2 Fs, and your F3 will be 1.45 Fs.

If your driver's Qts is ABOVE .4, (up to .56), then your ideal vented box size will be larger than Vas, your Fb and F3 will be BELOW Fs.

A driver with a Qts of .52 will have an ideal box volume of 2.4 Vas, and have an Fb of .75 Fs, and an F3 cutoff of .64 Fs.

The most desirable alignments are the "classic" .4 Qts on down to those requiring smaller Q's. The alignments requiring larger Qts will work, but will not have the same "snap" as the smaller Qts alignments.

As for closed box systems, you want a Qtc, (final Q of the closed box/driver combination), of between .7 and 1.0. Purists like a final Qtc of .5, but your output is 6 dB down at resonance in that alignment.

Fc is the resonance frequency of the closed box/driver combination.

When a driver is placed into a closed box, BOTH it's Qts and Fs are raised according to the same formula. For the raise in Q, the following formula is used:

Qtc = the square root of [(Vas/Vb) + 1] times Qts.

And applying the same formula to the resonance frequency:

Fc = the square root of [(Vas/Vb) + 1] times Fs.

So, a driver with a Qts of .5, if placed into a box that is one third it's Vas, will yield a driver/box combination that has a Qtc of 1.0 and an Fc that is twice the drivers Fs.

Any number of programs will give you these answers, but I thought I would give you some reasons as to why they arrive at these numbers. You can make your design decisions based on these principles.