sumber un

https://books.google.co.id/books?id=9ld1CwAAQBAJ&pg=PA501&lpg=PA501&dq=contoh+pernyataan+yang+setara+dgn+negasi+q+atau+p&source=bl&ots=xMVh6LP-2w&sig=1XEFXG9X-h1QiXrblkLklalxNsg&hl=id&sa=X&ved=0ahUKEwj1m-zJoObLAhXOno4KHWC2DqoQ6AEIRDAG#v=onepage&q=contoh%20pernyataan%20yang%20setara%20dgn%20negasi%20q%20atau%20p&f=false
(setara negasi)

https://blogersdana.wordpress.com/materi/contoh-soal/
(Pertdk samaan)

http://bahanbelajarsekolah.blogspot.co.id/2014/10/menentukan-nilai-maksimum-fungsi-objektif-pertidaksamaan-linear.html

(max nilai objek)