O memories reflect the operation of different systems, or are they different ways (processes) of accessing a unitary long-term store?

The topic is a part of Cognitive Psychology.
topic:
Do memories reflect the operation of different systems, or are they different ways (processes) of accessing a unitary long-term store?

Assessment criteria:
Coursework essays should be approximately 1500 words in length and must be typed using double spacing.

In all assessments students will be expected to demonstrate:
” their knowledge and understanding of relevant psychological
material
” their ability to present a reasoned argument in structured form
” their ability to present their work with an adequate level of
English grammar

APA style please.
some references what could be useful:

Martin, N., Carlson, N.R, and Buskist, w. (2007). Psychology.
Pearson London. (CH 8)
Braisby, N., Gellatly, A. (2005). Cognitive Psychology.
Eysenck and Keane (2000) Cognitive Psychology (might be CH.6,7)