Henderson, Robert "Copland's 'Inscape'", Tempo, No. 87 (Winter, 1968-1969), pp. 29-30, JSTOR.org. According to Henderson the first "twelve-note series" opens and closes the piece, while the second is the primary source of melodic material.
Rockwell, John (December 3, 1990). Obituary: "Copland, Dean of American Music, Dies at 90 ", NYTimes.com. Accessed April 18, 2016. "Such works as the Piano Quartet (1950), the Piano Fantasy (1957), 'Connotations' and 'Inscape' (1967) have made their way more slowly into the repertory than his easily accessible works."
sfsymphony.org
Steinberg, Michael (March 2016). Program notes: "Copland: Inscape", SFSymphony.org.
