Select the correct in-text citation in APA 6th edition. You can find our APA guide here [link].

Muller, S., Deicke, M. & De Doncker, R.W. (2002). Doubly fed induction generator systems for wind turbines. IEEE Industry Applications Magazine, 7(3), 26-33.

Question

Select the correct in-text citation in APA 6th edition. You can find our APA guide here [link].

Muller, S., Deicke, M. & De Doncker, R.W. (2002). Doubly fed induction generator systems for wind turbines. IEEE Industry Applications Magazine, 7(3), 26-33.

BlackTom AI · Accepted Answer

We need to evaluate each in-text citation option against APA 6th edition rules for citing a work with three authors in parentheses.
Option 1: '(Muller et al., 2002)'. This form uses 'et al.' to replace authors after the first citation, but in APA 6th edition, for a work with three to five authors, the first citation should list all authors (Muller, Diecke, & De Doncker, 2002). Using 'et al.' here is incorrect for the first citation, even though 'et al.' is used in subsequent citations. Also, if we considered subsequent citations, the punctuation would differ, so as a first citation this option is not acceptable.
Option 2: '(Muller, Diecke & De Doncker 2002)'. This version lists three authors, but it omits the comma before the year, and it uses an ampersand without the appropriate comma before it. APA 6th requires a comma before the year and a comma before the ampersand when listing three authors: '(Muller, Diecke, & De Doncker, 2002)'. Therefore this option is incorrect due to punctuation errors.
Option 3: '(Muller, Diecke & De Doncker, 2002)'. This option attempts to list multiple authors, but it is missing the comma before the ampersand. The correct APA 6th placement requires a serial (Oxford) comma before the final author, i.e., '(Muller, Diecke, & De Doncker, 2002)'. Because this option lacks the comma before '&', it is not fully correct according to strict APA 6th formatting rules. However, it is the closest among the three options when comparing author listing. 
In summary, option 1 misuses 'et al.' for a first citation with three authors, option 2 omits the comma before the year and uses an incorrect punctuation before the ampersand, and option 3 is closest but still misses the necessary comma before the ampersand. The precise correct form would be '(Muller, Diecke, & De Doncker, 2002)'.

Select the correct in-text citation in APA 6th edition. You can find our APA guide here [link]. Muller, S., Deicke, M. & De Doncker, R.W. (2002). Doubly fed induction generator systems for wind turbines. IEEE Industry Applications Magazine, 7(3), 26-33.

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