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Jarell mengungkapkan bahwa,”the open systems theory has been, and countinues to be, very influential in the industrialized countries of the world.” (1993:12) 

Jarell (1993:12) mengungkapkan bahwa, ”the open systems theory has been, and countinues to be, very influential in the industrialized countries of the world.” 

Jarell, (1993:12) mengungkapkan bahwa, ”the open systems theory has been, and countinues to be, very influential in the industrialized countries of the world.” 

Jarell, 1993/12 mengungkapkan bahwa, ”the open systems theory has been, and countinues to be, very influential in the industrialized countries of the world.” 

Jarell : (1993:12) mengungkapkan bahwa, ”the open systems theory has been, and countinues to be, very influential in the industrialized countries of the world.”