Mason, Adrienne
Sierra Club Books, 1999
Buku Referensi
Nurani Salikha
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2019
UI - Tugas Akhir
Metcalf, John
Oberon Press, 1978
Buku Teks SO
Astley, Thea
Angus and Robertson, 1958
Buku Teks SO
Hilliard, Noel
Heinemann, 1971
Buku Teks SO