Grammar, Usage / How to write intext citations for publications by NGO's where no author is mentioned ? [6]

Thank you so much . It is really useful. Please answer some more of my questions.I will be grateful
I am following the APA style ...according to their example :
One Author (when the text as whole needs to be cited)
o Reference in text

Last name (year of publication)
o Rowling (2005) argues for the development of new curricula.

o No reference in text
(Last name of author, copyright year).
o The development of new curricula has been argued before (Rowling, 2005).
1 .So if i want to give no reference in text ....do i have to write like this " According to the International Labour Organization (2012)," the first time when i refer and after that "According to ILO,(2012)" i mean i can use the abbreviation for the subsequent reference? ...also will it be wrong to cite like "Child labour has declined during past few years (ILO,2012) " ??

2. How can i give reference to 2 or 3 studies that convey the same idea e.g : "Many studies reveal that in the industrial era, the conditions of employed children became worse (Mills, 1987) , (Jason, 1991) (Smith,1995) " OR should i write like ... "In the industrial era the conditions of the children became worse, as their working hours increased considerably (Mills, 1987) and their employees, ruthlessly, subjected them to physical abuse (Jason, 1991)." Is it correct to write 2 citations in one sentence like above ?

3. If I took the material from a blog on internet ..should i include that in-text citation ...bcz the author is mentioned but not the publishing date ..the page says to cite the material as :Steven Mintz, "Childhood and Transatlantic Slavery," in Children and Youth in History, Item #57, website (accessed April 19, 2015).

4 . In what case the citation of anonymous is applicable?
5 .How much emotion can reflected in an academic essay ?
I know the post has become extensive ...but as i said I am a beginner ...:)