Gaya APA

Longknife, A., Sullivan, K. (2012). Easy writing skills step by step: master high frequency skills for writing profiency . : McGraw-Hill Book Company, Inc.

Gaya MLA

Longknife, Ann.., Sullivan, K.D.. "Easy writing skills step by step: master high frequency skills for writing profiency". : McGraw-Hill Book Company, Inc, 2012. .