APA Format
Friis, Robert H; Sellers, Thomas A. . (). Epidemiology... : Experimental study designs, ( ket. lihat bab. 8 ) ( halaman 295-326 ). : USA: Jones and Bartlett Publisherss, 2004
MLA Format
Friis, Robert H; Sellers, Thomas A. . Epidemiology... : Experimental study designs, ( ket. lihat bab. 8 ) ( halaman 295-326 ). : USA: Jones and Bartlett Publisherss, 2004,
Australian/Harvard Format
Friis, Robert H; Sellers, Thomas A. . . Epidemiology... : Experimental study designs, ( ket. lihat bab. 8 ) ( halaman 295-326 ). USA: Jones and Bartlett Publisherss, 2004, 
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