Gaya APA

Research Design. (2009). Los Angles: SAGE.

Gaya Chicago

Research Design. 3. Los Angles: SAGE, 2009. Buku.

Gaya MLA

Research Design. 3. Los Angles: SAGE, 2009. Buku.

Gaya Turabian

Research Design. Los Angles: SAGE, 2009. Buku.