How to cite different chapters of a book in the same paragraph? Background: I'm writing a master's thesis with APA citations.

In one paragraph, I cite two unrelated pieces of information that happen to come from different chapters of the same textbook. It's obvious from the chapter titles where in the book the second piece of information is located, but it's not obvious where the first piece is located. For the reader's sake, I'd like to be able to write something like:


  Here's what I'm doing. Here's an interesting fact (Trout, chapter 2, 1946) and this is what it implies in the context of my research. I then fit this interesting model, described by e.g. Trout, chapter 8 (1946).
  
  References:
  Trout, Kilgore. (1946). Ice-9 and its Applications. Ilium, NY: Slaughterhouse Press.


I've never seen this done before and I couldn't find anything like it in the Purdue OWL APA style guide. Another idea would be to cite each chapter separately, as in:


  Here's what I'm doing. Here's an interesting fact (Trout, 1946a) and this is what it implies in the context of my research. I then fit this interesting model, described by e.g. Trout (1946b).
  
  References:
  Trout, Kilgore. (1946a). Why ice is nice. In Ice-9 and its Applications. Ilium, NY: Slaughterhouse Press. 
  Trout, Kilgore. (1946b). Containment methods. In Ice-9 and its Applications. Ilium, NY: Slaughterhouse Press.


How should I cite this? Is there an established convention for this? Am I worrying too much?
If the chapters are part of a unified work (e.g., a textbook or monograph), then it's appropriate to use one citation, and to say the chapter in the text:


  Here's what I'm doing. Chapter 2 of (Trout, 1946) presents an interesting fact. I
  then fit the interesting model, described in Chapter 8 of (Trout, 1946).
  
  References: Trout, Kilgore. (1946). Ice-9 and its Applications. Ilium,
  NY: Slaughterhouse Press.


I'm not quite sure of where APA puts the parentheses; my point is about handling chapters as prose.

On the other hand, if the chapters are separate pieces of a collection (e.g., contributed texts in a "recent results in..." book), then each should have an independent entry in the bibliography.