APA

fellmann j. d., getis a. & getis j. (2007). human geography. new york: MC GRAW- HILL.

Chicago

fellmann jerome d, getis arthur and getis judith. 2007. human geography. new york: MC GRAW- HILL.

Harvard

fellmann j. d., getis a. and getis j. (2007). human geography. new york: MC GRAW- HILL.

MLA

fellmann jerome d, getis arthur and getis judith. human geography. new york: MC GRAW- HILL. 2007.